Marlow Mountain Rhyolite
Hand Sample: Phaneritic rhyolite. 10% fine-grained phenocrysts of sanidine and quartz and 90% dark-brownish-red groundmass. Weathers to brown-orange.
Thin Section: Very weathered matrix with a few fine-grained anhedral crystals of feldspar and quartz
Western Minerals, Inc.
Is Part Of
St. Francois Mountains Batholith, Missouri
Purchased from Western Minerals, Inc.
Number of Thin Sections