Hand Sample: Porphyritic diabase with coarse to very coarse grained subhedral pink-green plagioclase laths approximately 3cm in length set in a gray-black matrix. Inclusions of matrix present within plagioclase laths. Weathers to orange-brown.
Thin Section: Plagioclase laths fractured and rimmed with chlorite. Matrix includes 55% fine-grained interlocking euhedral plagioclase laths,10% opaques, among other mixed minerals.
Western Minerals, Inc
Is Part Of
St. Francois Mountains Batholith, Missouri
Purchased from Western Minerals, Inc.
Number of Thin Sections