Diorite Porphyry Dike
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
Western Minerals, Inc
Is Part Of
St. Francois Mts. Batholith, Missouri
Purchased from Western Minerals, Inc.
Number of Thin Sections