Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
Found on specimens from the second oxidation zone, section 49E on the 30th level, in association with carminite, beudantite, anglesite, mimetite, pharmacosiderite and beaverite
Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia