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!
Bridges et al. (2008): "clear blades and white needles of baryte occur in cavities with other supergene minerals and in one case can be seen to be crystallised on smithsonite."
