Granite Pegmatite, Gabbro Pegmatite and Diorite Pegmatite
Nepheline-Basanite, Analcite-Basanite and Leucite-Basanite
Generally rough to touch, Is one of the oldest rock, Source of corundum, tourmalines, beryls and topaz
Clasts are smooth to touch, Easily splits into thin plates, Has High structural resistance against erosion and climate, Used as a touchstone