Porphyritic Granite Dike
Hand Sample: Phaneritic granite with coarse-grained phenocrysts of smokey quartz and generally smaller crystals including potassium feldspar. Weathers to orange on one side and some light-gray material on the other.
Thin Section: 25% coarse-grained quartz phenocrysts in a matrix of 40% fine-grained rectangular plagioclase laths, 30% fine-grained alkali feldspar, and 30% fine-grained quartz.
Western Minerals, Inc.
Is Part Of
St. Francois Mountains Batholith, Missouri
Purchased from Western Minerals, Inc.
Number of Thin Sections