Silvermine Granite

Title

Silvermine Granite

Identifier

SFM-28

Description

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

Date

1/20/1969

Contributor

Western Minerals, Inc.

Spatial Coverage

St. Francois Mountains Batholith, Missouri

Accrual Method

Purchased from Western Minerals Inc.

Number of Thin Sections

1

Geolocation