Austinite var Cuprian with Calcite

A gossan matrix hosting a dense covering of minty green cuprian austinites on which a dozen or so lustrous light amber calcites perched. The result is a dazzling sparkling display of light refraction. I would typically coat the matrix with a stabilizer (concrete hardener-works great) but have yet to do so. It darkens the matrix but the crumbles go away. Buyers option!

Locality: Ojuela Mine, Mapimi, Durango, Mexico

Composition: calcium carbonate and calcium zinc arsenate