Results for: Mafic

How are mafic and felsic rocks different?

Felsic rocks are high in silicon (Si) and low in magnesium (Mg) and in iron (Fe). Gradation in feldspar causes felsic rocks to be richer in potassium (K). Mafic rocks are hig (MORE)

Is pegmatite felsic or mafic?

It is felsic because it is lightly colored. Most rocks that are light are also felsic. The exception is obsidian which is dark and felsic.

Why are mafic rocks dark?

They are dark due to their composition. They contain iron and magnesium which make them mafic. On the other hand, felsic rocks(opposite of mafic) contain silicon and aluminum. (MORE)
In Geology

What rocks are mafic?

Mafic is a chemical classification for igneous rocks containing 46-85% mafic (minerals rich in iron and magnesium) minerals. Some examples include gabbro, basalt, and scoria.
Thanks for the feedback!

Are igneous rocks mafic or felsic?

They can be either. Mafic and felsic are categories used to  classify igneous rocks based on composition. Other categories in  this system are intermediate and ultramafic.
Thanks for the feedback!

Is marble felsic or mafic?

Neither. The terms mafic and felsic refer to the composition of  igneous rocks, which are dominated by silicate minerals. Marble is  a metamorphic rock composed of carbonate (MORE)
In Uncategorized

Is rock salt felsic or mafic?

Neither. The terms mafic and felsic refer to the composition of  igneous rocks, which are dominated by silicate minerals. Rock salt  is a sedimentary halide rock. Such terms (MORE)

Is a limestone mafic?

No. The terms mafic and felsic apply to igneous rocks. Limestone is  a sedimentary/biochemical rock and so cannot be said to be mafic,  felsic, or intermediate.
Thanks for the feedback!

Can a volcano both be mafic and felsic?

Yes. Many stratovolcanoes vary in the composition of what they  erupt over time. They may cycle in the type of material. As the  magma chamber cools, the magma somtimes beco (MORE)