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!
"Azurite is fairly common as deep blue stains, veinlets and small nodules in the northern workings, where it seems to have been the main ore mineral. In the dumps of the South Shaft, azurite is only rarely seen as rosettes of dark blue acicular prisms, sometimes overlaying crusts of lavendulan."