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!
Cooper & Stanley (1990): "From the 30fm level dumps (Kingsbury, MS1). J. Hartley (pers. comm., 1987) confirmed the find as 'yellow earthy... in cavities in quartz with malachite."