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. (2011): "This mineral has recently been re-named as part of the reclassification of the pyrochlore group of minerals (Atencio et al., 2010). It occurs rarely as pale yellow powdery crusts in cavities with cerussite, anglesite and in one case with leadhillite and linarite."
