Diorite Porphyry Dike

Title

Diorite Porphyry Dike

Identifier

SFM-2

Description

Hand Sample: Holocrystalline, phaneritic, porphyritic, diorite with quratz crystals up to 3mm in diameter set in a field of smaller light gray, and dark gray crystals. Some small oxidized pyrite crystals. Very weathered on two sides to orange yellow color. Lesser weathering to a light-purple in other areas
Thin Section: Olivine, small quartz crystals, CPX, OPX, and plagioclase crystals overwritten by matrix material that comprises 75% of rock

Date

1/20/1969

Contributor

Western Minerals, Inc

Spatial Coverage

St. Francois Mts. Batholith, Missouri

Accrual Method

Purchased from Western Minerals, Inc.

Number of Thin Sections

1

Geolocation