Composition
If visable, the minerals in igneous rocks can be identified using the following key:
rounded irregular lumps no cleavage = Olive green/clear grey = olivine/Quartz
short rectangular crystals with cleavage = Pink,white/Black, green = feldspar/augite
long rectangular crystals with cleavage = White,clear,grey/Black,dark green = feldspar/hornblend
shimmering plates = Silvery/Black = Muscovite mica/biotite mica
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