Igneous Rocks are classified based upon their

1 answer:

7 0

igneous rocks can be "primary" rocks because they crystallize from a liquid. Sedimentary and metamorphic rocks
Igneous rocks may be simply classified according to their chemical/mineral composition as felsic, intermediate, mafic, and ultramafic
and by texture or grain size: intrusive rocks are course grained (all crystals are visible to the naked eye) while extrusive rocks may be fine-grained Volcanic rocks, especially felsic and intermediate, often have a porphyritic texture characterized by visible crystals floating in a fine-grained groundmass.

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