What is diorite in geology ?
Diorite : definition
Quartz diorites (tonalite, trondhjemite), rare rocks, have the particularity of possessing small quantities of quartz and alkaline feldspar, these two cumulative minerals not exceeding 10% of the mass of the rock. Diorites form small isolated massifs or linked to granite massifs.
Its volcanic equivalent is andesite, which is much more important from a quantitative point of view.