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!
Fe:Mn ratios of 8 obertiite root name samples has been determined with ratios between 4:1 and 3:2. It is currently not clear whether ferri-obertiite, mangani-obertiite or both occur at this locality, see also http://www.mindat.org/forum.php?read,14,342477,342721#msg-342721 for further information.