Igneous Rocks: Diorite
Diorite is an igneous rock formed from the partial melting of the crust caused from by basaltic magma from the mantle. It is associated with batholiths, dikes and stocks usually around volcanic arcs. Its volcanic equivalent is andesite which is formed from strombolian type volcanoes.
Diorite is a phaneritic rock that is speckled black and white/grey with a very variable colour index of between 40 and 90 over short distances. The rock has an equigranular or porphyritic texture and has a generally coarse grain size but can be pegmatitic. …
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