felsic and mafic rocks

Britannica Concise Encyclopedia: felsic and mafic rocks

Division of igneous rocks on the basis of their silicate mineral content, these minerals usually being the most abundant in such rocks. Rocks are described as felsic, intermediate, mafic, and ultramafic, in order of decreasing silica content, and, in general, the gradation from felsic to mafic corresponds to an increase in colour (i.e., light to dark). Due to the erroneous belief that silica present in rock magmas occurred in the form of silicic acid, high- and low-silica rocks were once known as acid and basic rocks, respectively.

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	How are felsic intermediate and mafic igneous rocks different? Read answer...
	As compared to mafic igneous rocks do all felsic igneous rocks cool and solidify more slowly? Read answer...
	How does Felsic magmas different from mafic magmas in color temperate minerals composition and the kind of rock each form? Read answer...

	What igneous rock is generally both felsic and mafic in compostion?
	Difference between felsic and mafic igneous rocks?
	What is the difference between the density in mafic and felsic rocks?