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!
"In 1921 a rich pocket of argyrodite was discovered in the “clavo Block” of the Gallofa vein. The mineral was encountered as compact masses and as magnificent simple octahedrons and sometimes with gemmy cube like calcite crystals associated with pyrargyrite, loellingite and rammelsbergite, sphalerite and quartz. Beautiful small star like little dodecahedral penetration twins were also rarely encountered." Ahlfeld & Reyes (1955)
Quality for species:
Excellent - world class for species or very significant. (!!)
Colquechaca, Colquechaca Municipality, Chayanta Province, Potosí, Bolivia