Hand Sample: Holocrystalline, fine-to-medium-grained granite. Mineralogy includes potassium feldspar and quartz. One corner of rock has a mass of dark grey-brown groundmass with inclusions of plagioclase laths and anhedral grey-green crystals. Weathers with a pinkish-orange.
Thin Section: 40% fine-grained well-weathered quartz, 40% fine-grained plagioclase feldspar, 10% biotite, 10% opaques
Western Minerals, Inc.
Is Part Of
St. Francois Mountains Batholith, Missouri
Purchased from Western Minerals Inc.
Number of Thin Sections