What Minerals Would You Not Find In A Felsic Igneous Rock?

Felsic rocks are commonly oversaturated and contain free quartz (SiO2), intermediate rocks contain little or no quartz or feldspathoids (undersaturated minerals), and mafic rocks may contain abundant feldspathoids.

What kinds of minerals would you find in a mafic igneous rock?

Mafic is an adjective describing a silicate mineral or igneous rock that is rich in magnesium and iron, and is thus a portmanteau of magnesium and ferric. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite.

how do you identify minerals in igneous rocks? Steps in Identification:

what are some common minerals in felsic rock?

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).

What is a felsic rock?

Felsic rocks are igneous rocks that are rich in feldspar and silicon. The word ‘felsic‘ was made up from parts of those words. Because they are made of lighter elements, they tend to be more buoyant than mafic rocks, which are rocks high in magnesium and iron, like basalt. Granite is the most common felsic rock.

What are the 4 compositions of igneous rocks?

As has already been described, igneous rocks are classified into four categories, based on either their chemistry or their mineral composition: felsic, intermediate, mafic, and ultramafic. The diagram in Figure 3.16 can be used to help classify igneous rocks by their mineral composition.

What is mafic used for?

Mafic is used for silicate minerals, magmas, and rocks which are relatively high in the heavier elements. The term is derived from using the MA from magnesium and the FIC from the Latin word for iron, but mafic magmas also are relatively enriched in calcium and sodium.

What is the most common type of extrusive rock?

Often, lava cools over a few days to weeks and minerals have enough time to form but not time to grow into large crystals. Basalt is the most common type of extrusive igneous rock and the most common rock type at the Earth’s surface.

What does Phaneritic mean?

Of or relating to an igneous rock in which the crystals are so coarse that individual minerals can be distinguished with the naked eye. Phaneritic rocks are intrusive rocks that cooled slowly enough to allow significant crystal growth. Compare aphanitic.

What is the opposite of mafic?

Mafic is a term used to describe both minerals that are rich in iron and magnesium and rocks that are rich in those minerals. The opposite of mafic minerals are felsic minerals, which are poor in iron and magnesium. Mafic minerals crystallize at higher temperatures, which Bowen’s Reaction Series describes.

Is Obsidian mafic?

Though obsidian is usually dark in color, similar to mafic rocks such as basalt, obsidian’s composition is extremely felsic. Obsidian consists mainly of SiO2 (silicon dioxide), usually 70% or more. Crystalline rocks with a similar composition include granite and rhyolite.

What is basalt used for?

Uses of Basalt It is most commonly crushed for use as an aggregate in construction projects. Crushed basalt is used for road base, concrete aggregate, asphalt pavement aggregate, railroad ballast, filter stone in drain fields, and may other purposes. Basalt is also cut into dimension stone.

Do mafic felsic rocks have more silica?

Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. 5. 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.

Which type of igneous rock would contain the most silica?

Felsic igneous rocks

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