Hogan Rhyolite (VanEast group)
Hand Sample: Porphyritic fine-grained light-pink and black phenocrysts in a reddish-purple-brown matrix. Hospitable to grey-brown lichen.
Thin Section: Primarily matrix with very-fine grains of well-weatherd opaques and quartz with a high purple and blue biofringence
Western Minerals, Inc.
Is Part Of
St. Francois Mountains Batholith, Missouri
Purchased from Western Minerals, Inc.
Number of Thin Sections