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!
Roscherite from Mount Mica Quarry was designated Unknown #3 and was being prepared for a new species description at that time. Mount Mica Quarry roscherite has subsequently been named greifensteinite. It is possible that the species exists in Mn-rich zones of the mineral, but data are unavailable.