DIORITE
Diorite
is an intermediate, intrusive igneous rock. It is the
coarsely-crystalline equivalent of andesite, having the same general chemistry
& mineralogy. Many diorites superficially resemble granites, but
diorites have little to no quartz, whereas granites have a significant quartz component
(otherwise they wouldn’t be true granites). The feldspar in
diorites is dominantly plagioclase, with a small to negligible potassium
feldspar component.
Diorite