Chalcopyrite with sphalerite

Abstract

Dull, brassy chalcopyrite crystals on resinous brown to darker brown sphalerite. Some of the sphalerite exhibits twinning according to the spinel law, some of which has a polysynthetic habit. This mineral specimen is from the Creede mining district, Colorado.

For more information about the Minerals of Creede, Colorado and the collection, see: http://libguides.mines.edu/GeologyMuseum/digitalcollectionsCreede.