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!
'UM1982-15-SiO:AlBaH' (not an IMA approved species)
Formula:
Ba-Al-Si-O-H
Comments:
Single-crystal XRD photographs of gobbinsite from the type locality indicate the presence of an oriented second phase with cell dimensions and Miller indices similar to those of merlinoite.