Mafic vs. Felsic: Know the Difference
By Shumaila Saeed || Updated on February 20, 2024
Mafic rocks are rich in magnesium and iron, typically darker, denser; felsic rocks are rich in silica, lighter in color, less dense.
Key Differences
Mafic rocks, characterized by a higher content of magnesium and iron, exhibit a darker coloration and higher density. Felsic rocks, on the other hand, are rich in silica and aluminum, leading to a lighter color and lower density.
Shumaila Saeed
Feb 18, 2024
In terms of mineral composition, mafic rocks typically contain minerals like pyroxene and olivine. Felsic rocks are dominated by minerals such as quartz and feldspar, which contribute to their lighter colors and lower densities.
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Feb 18, 2024
Mafic rocks, with their higher iron and magnesium content, tend to be harder and heavier. In contrast, felsic rocks, containing more silica, are generally lighter and less dense, often making them less hard than their mafic counterparts.
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Feb 18, 2024
The formation of mafic rocks is usually associated with volcanic activity and is prevalent in oceanic crusts. Felsic rocks are often found in continental crusts and are typically associated with intrusive rock formations.
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Feb 18, 2024
Mafic rocks, due to their composition, have a lower viscosity and a higher melting point. Felsic rocks, being richer in silica, have a higher viscosity and a lower melting point, impacting the nature of volcanic eruptions where they are involved.
Shumaila Saeed
Feb 18, 2024
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Comparison Chart
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Mafic and Felsic Definitions
Mafic
Rocks rich in magnesium and iron, typically dark in color.
Basalt, a common mafic rock, forms much of the oceanic crust.
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Jan 19, 2024
Felsic
Refers to igneous rocks with a high silica content.
Felsic magma is more viscous compared to mafic magma.
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Jan 19, 2024
Mafic
Refers to igneous rocks with a low silica content.
Mafic lava flows more easily due to its lower silica content.
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Jan 19, 2024
Felsic
Characterized by minerals like quartz and feldspar.
Felsic rocks are common in the Earth's continental crust.
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Jan 19, 2024
Mafic
Denotes igneous rocks with high iron and magnesium, lower in silica.
Mafic rocks tend to have a higher melting point.
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Jan 19, 2024
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Felsic
Denotes igneous rocks with lower iron and magnesium, higher in silica.
Felsic rocks tend to have a lower melting point.
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Jan 19, 2024
Mafic
Rocks that are denser and darker, often found in volcanic areas.
The volcanic island is mainly composed of mafic rocks.
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Jan 19, 2024
Felsic
Rocks high in silica and aluminum, usually light in color.
Granite is a common type of felsic rock found in continental crust.
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Jan 19, 2024
Mafic
Characterized by a composition of iron and magnesium-rich minerals.
Mafic rocks are predominant in the earth's mantle.
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Jan 19, 2024
Felsic
Rocks that are lighter and less dense, rich in silica.
Felsic rocks often form large, intrusive bodies like granite.
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Jan 19, 2024
Mafic
Relating to or containing a group of dark-colored silicate minerals, composed chiefly of magnesium and iron, that occur in igneous rocks, including hornblende, pyroxene, olivine, and biotite.
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Jan 15, 2024
Felsic
Relating to or containing a group of light-colored silicate minerals that occur in igneous rocks, including minerals of the feldspathoid group and the minerals quartz, feldspar, and muscovite.
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Jan 15, 2024
Mafic
(geology) Describing rocks, such as silicate minerals, magmas, and volcanic and intrusive igneous rocks, which contain relatively high concentrations of magnesium and iron.
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Jan 15, 2024
Felsic
(mineralogy) Enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.
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Jan 15, 2024
Repeatedly Asked Queries
What does 'felsic' mean?
Felsic refers to igneous rocks high in silica and aluminum, usually lighter in color and less dense.
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Feb 18, 2024
What minerals are common in mafic rocks?
Mafic rocks often contain minerals like pyroxene and olivine.
Shumaila Saeed
Feb 18, 2024
What does 'mafic' mean?
Mafic refers to igneous rocks rich in magnesium and iron, typically darker and denser.
Shumaila Saeed
Feb 18, 2024
Are felsic rocks common in continental crust?
Yes, felsic rocks like granite are typically found in continental crusts.
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Feb 18, 2024
Are mafic rocks found in oceanic crust?
Yes, mafic rocks like basalt are common in oceanic crusts.
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Feb 18, 2024
Do felsic rocks have a low melting point?
Yes, felsic rocks generally have lower melting points.
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Feb 18, 2024
Can mafic and felsic rocks be found together?
Yes, they can be found together, especially in areas with diverse geological activity.
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Feb 18, 2024
Is granite a felsic rock?
Yes, granite is a well-known type of felsic rock.
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Feb 18, 2024
Do mafic rocks have a high melting point?
Yes, mafic rocks tend to have higher melting points due to their composition.
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Feb 18, 2024
Are mafic rocks heavier than felsic rocks?
Generally, mafic rocks are denser and heavier than felsic rocks.
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Feb 18, 2024
What type of volcanic eruptions involve felsic rocks?
Felsic rocks are involved in more explosive volcanic eruptions due to their high viscosity.
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Feb 18, 2024
How does the composition of mafic rocks affect their use?
The dense and hard nature of mafic rocks makes them suitable for construction and industrial uses.
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Feb 18, 2024
What minerals are typical in felsic rocks?
Felsic rocks are rich in minerals like quartz and feldspar.
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Feb 18, 2024
What is the color of typical mafic rocks?
Mafic rocks are usually dark in color, like black or dark gray.
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Feb 18, 2024
What is the color of typical felsic rocks?
Felsic rocks are often lighter in color, such as white or pink.
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Feb 18, 2024
Do felsic rocks form intrusively or extrusively?
Felsic rocks often form intrusively, cooling slowly within the Earth's crust.
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Feb 18, 2024
What type of lava is associated with mafic rocks?
Mafic rocks are associated with less viscous, faster-flowing lava.
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Feb 18, 2024
Do mafic rocks form quickly or slowly?
Mafic rocks, especially those from volcanic lava, can form relatively quickly.
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Feb 18, 2024
Are felsic rocks more viscous than mafic rocks?
Yes, felsic rocks have higher viscosity due to their silica content.
Shumaila Saeed
Feb 18, 2024
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About Author
Written by
Shumaila SaeedShumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.
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