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!
Ferroan calcite is by far the most common type of calcite at the F19 cuttings. Normal calcite occurs as white to cream mammillary coatings lining cavities along with aragonite crystal sprays.