Carbonate-rich Shale, Siliceous Shale and Cannel Shale
Granite Pegmatite, Gabbro Pegmatite and Diorite Pegmatite
Easily splits into thin plates, Generally rough to touch, Is one of the oldest rock, Very fine grained rock
Generally rough to touch, Is one of the oldest rock, Source of corundum, tourmalines, beryls and topaz