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!
crusts and occasional sprays of acicular crystals are present in fractures and cavities in iron-stained quartz on specimens from the dump outside the northern trial (Green et al., 2009)