Title
Diorite (coarse-grained)
Identifier
SFM-14
Description
Hand Sample: Porphyritic (or coarse-grained phaneritic) diorite with coarse-grained white plagioclase laths up to 1cm and some black mineral. Weathering to rust-orange color.
Thin Section: 60% medium-grained interlocking rectangular plagioclase laths. Well-weathered smaller grains of quartz, biotite, and opaques fill in the spaces between laths.
Date
1/20/1969
Contributor
Western Minerals, Inc.
Is Part Of
Spatial Coverage
St. Francois Mountains Batholith, Missouri
Accrual Method
Western Minerals, Inc.
Number of Thin Sections
1