Granite Pegmatite, Gabbro Pegmatite and Diorite Pegmatite
Basaltic Kimberlites and Micaceous Kimberlites
Generally rough to touch, Is one of the oldest rock, Source of corundum, tourmalines, beryls and topaz
Always found as volcanic pipes over deep continental crust, Host rock for Diamond, Is one of the oldest rock, Surfaces are often shiny