Visuals Unlimited / Pegmatite is a very coarse grained plutonic igneous rock with a similar composition to granite.
Visuals Unlimited / Gabbro is a crystalline plutonic igneous rock consisting of plagioclase with minor amounts of augite.
Visuals Unlimited / Anorthosite is a plutonic igneous rock consisting of 90 to 100 percent feldspars and minor amounts of quartz.
John Cancalosi / Amazonite, a variety of microcline feldspar (potassium aluminium silicate). Feldspars are the principal constituents of igneous and plutonic rocks, among the most common minerals on Earth. Teller Coun...