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!
Forms in two habits. The first as minute platy hexagonal crystals. The second as unusual masses to 1.5cms of cellular flacky masses associated with litharge.
Milltown Quarry, Milltown, Ashover, North East Derbyshire District, Derbyshire, England, UK