what mineral composition is most characteristic of felsic rocks course hero

Felsic rocks are mostly feldspar (especially K-feldspar), at least 10% quartz, and less than 15% mafic minerals (biotite, hornblende). Within these four groups, rocks are named depending on whether they display coarse-grained or fine-grained textures.

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What mineral composition is most characteristic of mafic and intermediate rocks?

May 20, 2021 · 1. What mineral composition is most characteristic of felsic rocks? orthoclase, quartz, and biotite. orthoclase , quartz , and biotite. 2. What mineral composition is most characteristic of mafic rocks? olivine, pyroxene, and calcium-rich plagioclase.

Which rock sample is made from felsic lava?

Nov 30, 2017 · Question 1 of 37 2.7/ 2.7 Points What mineral composition is most characteristic of felsic rocks? A. olivine, pyroxene, and calcium-rich plagioclase B. orthoclase, quartz, and biotite C. calcium-rich plagioclase and hornblende with some olivine D. particles of volcanic ash welded together Answer Key: B Feedback: The correct answer is B. orthoclase, pyroxene, and calcium …

What are the igneous rocks composed mostly of ferromagnesian minerals called?

Jul 28, 2018 · Quiz 6.docx - Question 1 1 / 1 pts What mineral composition is most characteristic of felsic rocks? olivine, pyroxene, and calcium-rich

What are some examples of dark minerals in rocks?

May 27, 2021 · Question 1 3 out of 3 points What mineral composition is most characteristic of felsic rocks? Selected Answer: orthoclase, quartz, and biotite

What mineral composition is most characteristic of felsic?

Felsic rocks are mostly feldspar (especially K-feldspar), at least 10% quartz, and less than 15% mafic minerals (biotite, hornblende).Jan 2, 2022

What characteristics do felsic rocks have?

Felsic magma or lava is higher in viscosity than mafic magma/lava. Felsic rocks are usually light in color and have specific gravities less than 3. The most common felsic rock is granite. Common felsic minerals include quartz, muscovite, orthoclase, and the sodium-rich plagioclase feldspars (albite-rich).

Which rock is of felsic composition?

graniteIgneous Rocks: textures and compositionsFelsicMaficCoarse- grainedgranitegabbroFine- grainedrhyolitebasaltMineralsquartz, K-feldspar, amphibole, muscovite, biotiteolivine, pyroxene, Ca-feldspar (plagioclase)Feb 23, 2005

What mineral composition is most characteristic of mafic rocks Group of answer choices?

mafic rock, in geology, igneous rock that is dominated by the silicates pyroxene, amphibole, olivine, and mica. These minerals are high in magnesium and ferric oxides, and their presence gives mafic rock its characteristic dark colour.

What is a felsic mineral and which mineral groups are considered felsic?

Common felsic minerals include quartz, muscovite mica, and the orthoclase feldspars. The most common felsic rock is granite, which represents the purified end product of the earth's internal differentiation process.

What minerals are commonly found in a felsic igneous rock?

The felsic minerals include quartz, tridymite, cristobalite, feldspars (plagioclase and alkali feldspar), feldspathoids (nepheline and leucite), muscovite, and corundum. Because felsic minerals lack iron and magnesium, they are generally light in colour and consequently are referred to as such or as leucocratic.

How are felsic minerals formed?

As previously mentioned, felsic igneous rocks form out of the solidification of magma or lava. Magma is molten rock within and beneath the Earth's crust or lithosphere. Magma can rise through channels in the Earth's crust because, in liquid form, it is less dense than the rocks around it.Oct 18, 2021

How do felsic rocks differ from mafic igneous rocks?

The main difference between Mafic and Felsic rocks are the silica content present. Since igneous rocks are characterised by silica content in them, mafic is the one with less silica content (approx. 45-55%) while felsic is the one with a greater silica content (approx. 70-90%).

What are the common minerals in felsic intermediate mafic and ultramafic rocks What are examples of each of these rocks?

Igneous Rock ClassificationCompositionColorMineralsFelsicLightQuartz, orthoclase feldsparIntermediateIntermediatePlagioclase feldspar, biotite, amphiboleMaficDarkOlivine, pyroxeneUltramaficVery darkOlivineJul 3, 2019

What determines a rock to be mafic or felsic?

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 ultramafic.

What is the composition of this rock?

Composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock (the two are obviously related). Texture refers to the size and arrangement of the minerals or grains that make up a rock.

Is plagioclase mafic or felsic?

Image DescriptionsIgneous RocksFelsicMaficQuartz25 to 35%0%Plagioclase feldspar25 to 50%0 to 50%Biotite and/or Amphibole0 to 20%0 to 30%Pyroxene0%20 to 75%4 more rows