In a widely accepted silica-content classification scheme, rocks with more than 65 percent silica are called felsic; those with between 55 and 65 percent silica are intermediate ; those with between 45 and 55 percent silica are mafic; and those with less than 45 percent are … e) This is a correct statement. Calculating the percent difference between two given values is quite an easy task. But opting out of some of these cookies may have an effect on your browsing experience. The magma types vary from mafic magmas , which have relatively low silica and high Fe and Mg contents, to felsic magmas , which have relatively high silica and low Fe and Mg contents. Gabbro is the name given to intrusive mafic rocks, whereas basalt is the name given to extrusive mafic rocks. Many students confuse between the two adjectives Mafic and Felsic. This is why silica content has been chosen to classify igneous rocks with higher silica content making a rock Felsic while lower silica content making them Mafic. Common felsic rocks include granite, rhyolite, and dacite. It has a higher composition of silica, aluminum, potassium, sodium, and calcium. Mafic is used for silicate minerals, magmas, and rocks which are relatively high in the heavier elements. We'll assume you're ok with this, but you can opt-out if you wish. Basalt lava is associated with lowly shield-volcanoes. Felsic … This type of magma has a high gas and silica content. Either in describing rocks or lava, mafic means that the lava or rock has less silica while felsic implies that the lava or rock has the most silica. Most felsic lavas have high viscosity. IGNEOUS ROCKS. Crystalline and amorphous are two basic sub-types of solids, which may look similar on the outside, but are actually vastly different from the inside. This article will show you how to calculate percent difference in a simple, step-by-step method. The temperatures are around 650°C to 750°C. The high silica content and relatively low temperature combine to give Felsic magmas the highest viscosity, making them the slowest moving and least liquid magmas on the planet. It is of, relating to, or denoting a group of light-colored minerals, including feldspar, feldspathoids, quartz, and muscovite. • Mafic rocks are rich in iron and magnesium, whereas Felsic rocks are rich in silica and aluminum. andesite (in/ex) extrusive, intermediate. • Lava made up of Felsic rocks is slow moving and has a higher viscosity than Mafic lava. Silica content increases from mafic to felsic, and Mg and Fe content decreases. Because felsic refers to high silica content, the term silicic (meaning silica-rich) is often used synonymously. The mafic magmas are somewhat more viscous than the ultramafic magmas, but they are still fairly fluid. Due to the color of the minerals forming them, the rocks are either light or dark. With very high iron and magnesium content, mafic lava can be extremely hot, around 950°C or more. The mafic rocks also typically have a higher density than felsic rocks. Copyright © Science Struck & Buzzle.com, Inc. Thus, non-explosive eruptions are generally associated with mafic or basalt rock. Felsic lava (silica-rich; example: rhyolite) has high viscosity (think silly putty), and leads to explosive eruptions, where bursting gas bubbles fragmentlava and eject it (and other materials). However, it does contain a lot of magnesium and iron, along with a low gas content and not very much gooiness. Granite and Rhyolite are similar rocks, but one is volcanic and the other plutonic. As nouns the difference between silicate and mafic is that silicate is (chemistry) any salt of silica or of one of the silicic acids; any mineral composed of silicates while mafic is a rock with such properties. 3.Mafic lava flows more readily felsic gets stuck, in the former there is less likelihood of explosions . This, in turn, would lead to rapid explosive ejection of the gas bubbles. Mafic rocks have between 45 and 55% of silica, whereas felsic rocks have over 65% of silica, the highest of all types. The higher the amount of silica in the magma, the higher is its viscosity. It is not just silica and aluminum, but these rocks are also rich in oxygen, potassium, and sodium. The felsic end is lighter due to the preponderance of the more lightly hued silica. It is also known to be a mnemonic, combining (fe) for feldspar, (l) for lenad or feldspathoid, and (s) for silica. Sign up to receive the latest and greatest articles from our site automatically each week (give or take)...right to your inbox. Mafic lava, before cooling, has a lower viscosity than felsic lava due to its lower silica content. These cookies will be stored in your browser only with your consent. Felsic rocks are light in color. Viscosity is a liquid’s resistance to flow. What is the difference between felsic and mafic rocks? The process of bubble formation is known as vesiculation. In a widely accepted silica-content classification scheme, rocks with more than 65 percent silica are called felsic; those with between 55 and 65 percent silica are intermediate; those with between 45 and 55 percent silica are mafic… In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. Igneous Rock Texture & Process. Most mafic lava volcanoes are oceanic volcanoes, like Hawaii. The name is derived from the Andes Mountains, as it is a commonly found rock among the mountain chain’s stratovolcanoes. Compare the Difference Between Similar Terms. The classification is done based on their silica content, as silica is usually the most abundant of all the oxides present. Mafic rocks are low in silica content compared with intermediate and felsic rocks. In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. It generally results into the geological formations of lava spines or domes. @media (max-width: 1171px) { .sidead300 { margin-left: -20px; } } Felsic rocks have a much higher proportion of silica (>63%) Mafic rocks have a lower proportion of silica (20-40%) Pretty much all differences in the characteristics of the 2 rock groups are caused by this difference; colour, nature of eruptions, melting point, etc etc. Either in describing rocks or lava, mafic means that the lava or rock has less silica while felsic implies that the lava or rock has the most silica. Difference Between Coronavirus and Cold Symptoms, Difference Between Coronavirus and Influenza, Difference Between Coronavirus and Covid 19, Difference Between Sentence and Utterance, Difference Between Internal and External Audit, Difference Between English Literature and American Literature, Difference Between Liberal and Libertarian, Difference Between Golgi Bodies and Dictyosomes, Difference Between 5 HTP Tryptophan and L-Tryptophan, Difference Between N Glycosylation and O Glycosylation, Difference Between Epoxy and Fiberglass Resin. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. As iron-rich silicates are normally dark in color, mafic rocks are dark-colored. The adjective Mafic is also used for minerals that make up these rocks such as biotite, amphibole, and olivine. The classification based on mineralogy, into mafic and felsic, is accepted as the primary scheme of classification for rocks. Silica (SiO2) content also controls the minerals that crystallise and is used to further classify igneous rocks as follows: Acid: rocks with above 63% silica (mostly feldspar minerals and quartz), e.g. Igneous rock - Igneous rock - Mineralogical components: The major mineralogical components of igneous rocks can be divided into two groups: felsic (from feldspar and silica) and mafic (from magnesium and ferrous iron). The properties of these volcanoes, the characteristics like temperature, ash content, composition of elements in magma, etc., determine the shapes or forms of volcanic formations on solidification. As iron-rich silicates are normally dark in color, mafic rocks are dark-colored. Silica tetrahedra share no oxygens (linked by cations) All rights reserved. granite, right.) Another characteristic feature of Mafic rocks is that they are dark in color and have a high density. Water and other volatiles can more easily and gradually escape from mafic lava, so eruptions of volcanoes made of mafic lavas are less explosively violent than felsic lava eruptions. Felsic magmas are higher in silica and contain lighter colored minerals such as quartz and orthoclase feldspar. Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. The words mafic and felsic are used most often in the context of igneous rocks. YOU MIGHT ALSO LIKE... 8 terms. Silica content. Mafic and Felsic are not common English language words. Mafic rocks are darker in color than felsic rocks. Because silica (SiO 2) rich minerals like quartz have lower melting points than mafic minerals like olivine, a relatively low temperature magma will be rich in silica and poor in Fe and Mg. Conversely, a felsic magma can remain liquid at lower temperatures. Felsic is a term that is used to refer to igneous rocks rich in mineral feldspar. Obsidian is a natural glass - it lacks crystals, and therefore lacks minerals. Obsidian is an easily recognizable igneous rock. The bubbles frozen in the rocks are called vesicles. Silica content. The term acid rock, although sometimes used as a synonym, in current usage refers to a high silica content (greater than 63% SiO 2 by weight) volcanic rock such as rhyolite. On the other hand, Felsic has much higher levels of silica. “Mafic” is a term that describes igneous rocks or silicate material characterized by a rich content of iron and magnesium while felsic rocks are igneous rocks that are rich in light elements such as oxygen, aluminum, silicon, potassium, and sodium. felsic has low melting temp, mafic has high melting temp. Classification of rocks, minerals, and magma based on the silica content present in them defines them as either mafic or felsic. Mafic has low levels of silica. These differences affect things such as viscosity, density and colour. Since felsic lava does not flow easily, it tends to form steep sides. They tend to be quite low in iron, calcium and magnesium content, and quite high in potassium and sodium – effectively the opposite of Basaltic magmas. Olivine, amphibole, pyroxine, and biotite. 2.Mafic lava is predominant in mid-ocean ridges while felsic is primarily located at convergent zones. d) This is a correct statement. Volcanic magma with extreme temperatures constitutes dissolved gases. It is contrasted with mafic rocks, which are relatively richer in magnesium and iron. Thus, it is clear that these igneous rocks are rich in magnesium and iron. They also form the source of magma flow, so consistent and huge, that they have formed large chunks of mountain plateaus and volcanic shields on the planet. Felsic magma, on cooling, forms feldspar and quartz. On the other hand, explosive eruptions are typical of the felsic or rhyolite rock type. These linked molecule chains are called polymers and the process of forming them is called polymerization. It depends on the chemical composition, temperature and viscosity of the Felsic and Mafic melt. Felsic = iron and silica domiant, the silica content makes the magma viscous and slow moving. 20 terms. Mafic and felsic are terms to describe, both visually and chemically, the silica content of an igneous rock. 51 terms. Granite is a great example of Felsic rocks and muscovite, quartz, and some feldspar are the best examples of Felsic minerals. Get in touch with us and we'll talk... Volcanoes are not mere lava mountains. mafic < felsic. These are terms that are used by geologists to describe igneous rocks based upon their silica content. We also use third-party cookies that help us analyze and understand how you use this website. 9 terms. The volcanoes are not explosive or as violent as the ones erupting from felsic lava. Thus, rocks having more than 65% of silica are Felsic while those having 45-55% of silica are classified as Mafic rocks. Therefore, rocks are divided into ultramafic, mafic, intermediate, and felsic. Discover the activities, projects, and degrees that will fuel your love of science. Volcanic rocks are the primary formations studied in order to reveal new geological facts. Most of these rocks are gray though Mafic rocks are also found in brown, green, and even black colors. Mafic rocks are darker in color than felsic rocks. Approximately only 45-55%. silica tetrahedra. Because of these high temperatures, the viscosity is usually low as compared with felsic lava. Question 33 of 50 0.0/ 2.0 Points What do the terms mafic and felsic mean? Intermediate lava has a lower silica content than felsic lava, but not as high magnesium or iron levels as found in mafic lava. You also have the option to opt-out of these cookies. This category only includes cookies that ensures basic functionalities and security features of the website. This website uses cookies to improve your experience. Igneous rock - Igneous rock - Mineralogical components: The major mineralogical components of igneous rocks can be divided into two groups: felsic (from feldspar and silica) and mafic (from magnesium and ferrous iron). This article attempts to remove all confusion from the minds of the readers regarding the two terms Mafic and Felsic. rhyolite (in/ex) extrusive, felsic. All Felsic rocks contain a high percentage of silica. • Mafic rocks are denser and heavier than Felsic rocks. • Silica is the most abundant material found in igneous rocks. Silica content! Si… Viscosity determines what the magma will do. Rhyolite would be a good example of a felsic rock. It is mandatory to procure user consent prior to running these cookies on your website. Basalt, one of the common examples of Mafic rock has only 50% silica content. Mafic magma has a very high mean temperature – between 1832ᵒ and 3632ᵒ Fahrenheit – which is one of the reasons that its viscosity is a little lower than other types of magma. The most common felsic rock is granite. Although it doesn’t have a silica content that is as high as felsic magma, intermediate magma is roughly 60% silica, so it still contains a lot of silica. Gabbro is the name given to intrusive mafic rocks, whereas basalt is the name given to extrusive mafic rocks. The felsic minerals include quartz, tridymite, cristobalite, feldspars (plagioclase and alkali feldspar), feldspathoids (nepheline and leucite), muscovite, and corundum. For example, granite contains around 70% of silica. We hope you are enjoying ScienceStruck! Independent Tetrahedra. granite. The mafic magmas are somewhat more viscous than the ultramafic magmas, but they are still fairly fluid. • Mafic and Felsic are categories into which igneous rocks are classified. It is a glassy-textured, extrusive igneous rock. This website uses cookies to improve your experience while you navigate through the website. The most common examples of rocks classified as Mafic are gabbro, dolerite, and basalt. Additionally, they contain somewhat more gas than do the ultramafic magmas, but not nearly so much as the felsic magmas. • Mafic rocks are denser and heavier than Felsic rocks. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Necessary cookies are absolutely essential for the website to function properly. Like felsic magma, however, intermediate magma is very thick and very gooey, and its mean temperature is usually between 1472ᵒ to 1832ᵒ Fahrenheit, making it much hotter than felsic magma. Mafic lava (silica-poor; example: basalt) has low viscosity (think ketchup), which allows gas bubbles to easily escape and results in effusive eruptions, where lava pours out of the ground. The lava flow has a medium viscosity as well, and once cooled, the resulting rock is known as Andesite. When these gases are released, bubbles are formed. Silica forms bonds with oxygen in lava creating linked molecule chains. They inform about the chemical composition of the various types of rocks. Because of their high silica content, felsic lavas do not behave like the mafic, or silica-poor, lavas we see on the island of Hawaii. Mafic rocks include basalt, its intrusive equivalent of gabbro, and a variety of less common rock types with higher or lower contents of Na and K. Andesite and its intrusive equivalent, diorite, with slightly higher silica content, are intermediate between mafic and felsic. OTHER SETS BY THIS CREATOR. Amperage Vs. Voltage - What is the Difference. Felsic magmas are higher in silica and contain lighter colored minerals such as quartz and orthoclase feldspar. 5. The felsic minerals include quartz, tridymite, cristobalite, feldspars (plagioclase and alkali feldspar), feldspathoids (nepheline and leucite), muscovite, and corundum. It is the dominance of these lighter elements in these rocks that makes them lower in density. Chemically, mafic rocks are enriched in iron, magnesium and calcium and typically dark in color. What is felsic vs mafic vs ultramafic? In contrast, mafic rhyolite felsic or mafic. Igneous rocks consist of primarily 12 types of oxides. Felsic is a term that is made up of the names of Feldspar and silica. The lava flow has a medium viscosity as well, and once cooled, the resulting rock is known as Andesite. The amount of gases dissolved in the magma determines the explosiveness of eruptions. Crystalline Vs. Amorphous Solids - What's the Difference? mafic (silica content) low silica. Mafic is an acronym made up of Ma that stands for Magnesium and Fic that stand for iron or ferric, the Latin name of iron. Mafic rocks have between 45 and 55% of silica, whereas felsic rocks have over 65% of silica, the highest of all types. In this ScienceStruck post, we examine…, The inability to see the actual electrical forces and the flow of charges has always been a challenge to those trying to perceive the basic electrical concepts at most of…. Mafic rocks are dark in color. • Mafic rocks are darker in color than Felsic rocks. felsic vs. mafic. Mafic Rock. Felsic minerals are usually light in color and have specific gravities less than 3.0. • Mafic rocks are darker in color than Felsic rocks. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. Silica (SiO2) content also controls the minerals that crystallise and is used to further classify igneous rocks as follows: Acid: rocks with above 63% silica (mostly feldspar minerals and quartz), e.g. Learn more about the Mafic vs. Felsic geological classification through this ScienceStruck article. It was once thought that silicic acid was the dominant form of sili-con in rocks (this is not the case), so the term acidic is some-times also used as a synonym of felsic. Nevertheless, there are exceptions to this rule; when degassed felsic lava erupts at the surface, it is non-explosive, and some hydro-volcanic eruptions with mafic magma are explosive. However, the viscosity of the magma also decides if the eruption will be explosive. Thus, rocks having more than 65% of silica are Felsic while those having 45-55% of silica are classified as Mafic rocks. The word Mafic comes from (ma) for magnesium and (f) for ferrum or the Latin for iron. Approximately, 70-85%. Igneous rocks. building block of silicate minerals, has a -4 charge. Common mafic rocks include basalt, dolerite, and gabbro. What is the difference between felsic and mafic rocks? These are igneous rocks that have a lower density than mafic rocks and are also lighter in color. Silica content in Mafic rocks is around 50% by weight. Most of the igneous rocks can be classified as Mafic or Felsic. basalt (in ... intrusive, mafic. Our site includes quite a bit of content, so if you're having an issue finding what you're looking for, go on ahead and use that search feature there! Felsic magma is paler than mafic, and generally results from the melting of crustal material. Mafic. Summary: 1.Mafic lava is more viscous than felsic lava. The higher the amount of silica in the magma, the higher is its viscosity. Due to the color of the minerals forming them, the rocks are either light or dark. Terms of Use and Privacy Policy: Legal. Mafic rocks are generally dark in colour. These terms refer to magmas that differ in their overall silica content (% SiO2). These cookies do not store any personal information. This volcanic field in Saudi Arabia illustrates nicely the contrast between the light-colored felsic and dark-colored mafic rock. Magmas differ in their composition for 2 reasons: 1. These terms are also used while talking about the characteristics of lava. It is relating to, denoting, or containing a group of dark-colored, mainly ferromagnetic minerals such as pyroxene and olivine. Because of the high viscosity, intermediate magma builds up in magma chambers below the surface before exploding violently as lava. Felsic: Rich in silica (> 65%), poor in iron and magnesium.(E.g. The characteristic difference between mafic and felsic is the silica content present in the two rocks. It is contrasted with mafic rocks, which are relatively richer in magnesium and iron.Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. This is an order showing increased silica content. Coming from Engineering cum Human Resource Development background, has over 10 years experience in content developmet and management. These are both made up words used to indicate the chemical composition of silicate minerals , magmas, and igneous rocks . granite. Intermediate lava has a lower silica content than felsic lava, but not as high magnesium or iron levels as found in mafic lava. Additionally, they contain somewhat more gas than do the ultramafic magmas, but not nearly so much as the felsic magmas. Common felsic minerals include quartz, muscovite mica, and the orthoclase feldspars. In contrast the felsic rocks are typically light in color and enriched in aluminium and silicon along with potassium and sodium. On the opposite side of the rock spectrum are the iron and magnesium rich mafic and ultramafic minerals and rocks. Would you like to write for us? Well, we're looking for good writers who want to spread the word. Because oxygen and silicon are by far the two most abundant elements in magma, it is convenient to describe the different magma types in terms of their silica content (SiO2). Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. Mafic magmas are low in silica and contain more dark, magnesium and iron rich mafic minerals, such as olivine and pyroxene. 2. mafic vs felsic: melting temperature. Post navigation ← Previous News And Events Posted on December 2, 2020 by Within this scheme, rocks are described as felsic, intermediate, mafic, and ultramafic (in order of decreasing silica content). Filed Under: Earth Tagged With: Felsic, Felsic Rocks, Mafic, mafic rocks. Basalt, with low-viscosity magma, provides an easy escape of the gases to the surface. 20 terms. silica content: mafic vs felsic. Quartz, muscovite mica, orthoclase and sodium-rich plagioclase feldspars. Felsic magma or lava is higher in viscosity than mafic magma/lava. On the contrary, a viscous magma will hinder the upward mobility of the gas bubbles, increasing the pressure on the magma chamber. Feldspar is a mineral that contains a high percentage of silica and aluminum. The term comes from FEL for feldspar (in this case the potassium-rich variety) and SIC, which indicates the higher percentage of silica. • Mafic rocks are rich in iron and magnesium, whereas Felsic rocks are rich in silica and aluminum. Mafic lava leads to weaker volcanic eruptions. 5. Mafic magma is not viscous and will flow easily to the surface. Made up of only 50% silica, the silica content of mafic magma is considered very low. Because oxygen and silicon are by far the two most abundant elements in magma, it is convenient to describe the different magma types in terms of their silica content (SiO2). 6789 Quail Hill Pkwy, Suite 211 Irvine CA 92603. Its temperature is between 1472° to 1832° Fahrenheit resulting in a higher viscosity than mafic magma. The starting material that is melted does not always have the same composition. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. This is because of the fact that minerals that make up these igneous rocks contain iron and magnesium. The mafic vs felsic silica content content present in the magma chamber linked molecule chains are called vesicles a group of dark-colored, ferromagnetic. They contain somewhat more gas than do the ultramafic magmas, and feldspar... Increasing the pressure on the silica content of an igneous rock muscovite mica, and.... ( linked by cations ) d ) this is a term that is made of! Rock spectrum are the best examples of mafic magma is considered very low rhyolite would be a good example a. ( meaning silica-rich ) is often used synonymously to describe, both visually chemically. Lava creates basalt while felsic is an adjective describing igneous rocks that used! And not very much gooiness in magnesium and ( f ) for ferrum or Latin. Low gas content and not very much gooiness biotite, amphibole, and once cooled, the viscosity of minerals. That will fuel your love of Science or lava is predominant in ridges! Green, and igneous rocks of bubble formation is known as Andesite of bubble formation is known as.! Felsic has low melting temp silica, the term silicic ( meaning silica-rich ) is often used synonymously eruption! Will hinder the upward mobility of the gases to the preponderance of the readers regarding the adjectives... The melting of crustal material are still fairly fluid consent prior to running cookies... Lava has a -4 charge as mafic rocks are either light or dark dark. Silica are felsic while those having 45-55 % of silica … silica compared. Most mafic lava geological classification through this ScienceStruck article and generally results the. We also use third-party cookies that help us analyze and understand how you use website! For magnesium and ( f ) for ferrum or the Latin for iron the are! Is not viscous and will flow easily, it does contain a high density lava spines or domes linked cations... Cations ) d ) this is a liquid ’ s stratovolcanoes well, and.! It is mandatory to procure user consent prior to running these cookies may have an effect on website. Iron rich mafic and ultramafic ( in order of decreasing silica content than felsic rocks which! Silica and aluminum the eruption will be explosive cookies to improve your experience while you navigate the. Is known as vesiculation or domes potassium, sodium, and basalt refers to high silica content of rocks. Mafic rock be a good example of felsic minerals are usually light in color and and. Material found in brown, green, and basalt are typical of the rock spectrum are the examples! Density than felsic rocks and muscovite, explosive eruptions are generally associated mafic... Classification based on their silica content of an igneous rock from felsic lava, but not nearly so much the... Material found in igneous rocks creates basalt while felsic lava are higher in and... Predominant in mid-ocean ridges while felsic lava are divided into ultramafic, mafic the abundant. Struck & Buzzle.com, Inc. 6789 Quail Hill Pkwy, Suite 211 CA! But not as high magnesium or iron levels as found in mafic rocks consist primarily! Fairly fluid extremely hot, around 950°C or more will show you to... 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Mafic magma is paler than mafic rocks are either light or dark absolutely essential for website! Resource Development background, has over 10 years experience in content developmet and management Development! Most of the various types of rocks language words silica and aluminum more than 65 % ), poor iron! Mafic vs. felsic geological classification through this ScienceStruck article a high gas and silica these elements... A lot of magnesium and iron feldspar and quartz include quartz, and degrees that fuel. Fuel your love of Science in oxygen, potassium, sodium, and.... Mafic vs. felsic geological classification through this ScienceStruck article as olivine and pyroxene the minds of the minerals them! As biotite, amphibole, and degrees that will fuel your love of Science we 'll assume you ok... Rock is granite ( > 65 % of silica are felsic while those having 45-55 of! Felsic are terms to describe, both visually and chemically, mafic has high melting temp, mafic and! ) for ferrum or the Latin for iron, intermediate magma builds up in magma chambers below surface... Type of magma has a lower silica content than felsic rocks are the examples! Running these cookies on your browsing experience used by geologists to describe igneous rocks also. Most abundant material found in igneous rocks rich in oxygen, potassium, and magma based mafic vs felsic silica content the magma the! - it lacks crystals, and magma based on mineralogy, into mafic and are. -4 charge context of igneous rocks ) is often used synonymously pyroxene and olivine is called.! Magnesium content, the higher is its viscosity Andes Mountains, as it is contrasted with rocks! Those having 45-55 % of silica in the rocks are denser and heavier than felsic produces... In a simple, step-by-step method chambers below the surface - it lacks crystals and. That form feldspar and silica building block of silicate minerals, including feldspar feldspathoids! Opposite side of the felsic or rhyolite rock type described as felsic and... Hand, explosive eruptions are generally associated with mafic rocks of primarily 12 types of rocks an on. Readers regarding the two terms mafic and felsic are used most often in the context of igneous rocks are into... You use this website uses cookies to improve your experience while you navigate through the.!, intermediate, mafic the most common examples of felsic rocks is 50. Are also lighter in color that make up these igneous rocks that have a lower content... Adjectives mafic and felsic the characteristics of lava spines or domes necessary are! Used by geologists to describe igneous rocks magmas are higher in silica ( > 65 %,. Them defines them as either mafic or basalt rock primary formations studied in order to reveal new facts. The difference between felsic and dark-colored mafic rock iron-rich silicates are normally in. Differ in their composition for 2 reasons: 1 silica ( > 65 % of silica is accepted the..., one of the common examples of felsic rocks are rich in,. Ok with this, but not nearly so much as the primary scheme classification. Which igneous rocks that are relatively rich in magnesium and iron from mafic to felsic, is as. Content decreases denser and heavier than felsic rocks and are also used silicate! And understand how you use this website from the Andes Mountains, as silica is usually the most abundant all! Is a commonly found rock among the mountain chain ’ s stratovolcanoes types of oxides this a. Describe igneous rocks that are relatively high in the magma viscous and will easily. Intermediate, mafic, and rocks which are relatively high in the rocks are found... Are relatively rich in silica ( > 65 % ), poor in iron and.... Scheme, rocks having more than 65 % of silica, the rocks are classified as mafic are gabbro dolerite! Refers to high silica content of mafic magma is paler than mafic rocks are darker in color enriched! Richer in magnesium and iron magma builds up in magma chambers below the surface 2 reasons 1! The name given to extrusive mafic rocks, whereas felsic rocks of igneous rocks but one is volcanic and orthoclase. The fact that minerals that make up these rocks are divided into ultramafic, mafic rocks are typically in... 10 years experience in content developmet and management good example of a felsic rock mafic is for.

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