Chalcocite ps. After Pyrite (RARE Utah) Dr. B. Phillips Coll.

Item Description

Chalcocite and pyrite are EXTREMELY RARE from Utah's La Sal Mountains, famous for very fine azurite specimens. This is possibly a UNIQUE pseudomorph of matte-finish dark charcoal-gray chalcocite replacing intergrown, flattened, modified pyrite cuboctahedrons. The pseudos rest on a sandstone matrix. Not pretty to look at, but this is an important and rare Utah pseudomorph from the Dr. Barratt Phillips Collections. Come with a 1960s-70s era label.