Siderite on sphalerite on pyrite

Abstract

Small discs of siderite, on black sphalerite crystals, on pyrite. This mineral specimen is from the Eagle mine, Gilman mining district, Eagle County, Colorado.

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