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!
"The lead phosphate is closely associated with galena from which it derives by alteration. It occurs as microcrystalline apple green coatings on the inner side of some cavities in the quartz lenses. Viewed under the scanning electron microscope, the crystals, less than 50 µm in size, appear to be formed by a prism {1010} extended by curved faces. Qualitative chemical analysis shows major Pb, P and Cl with lower quantities of Ca, Cd and As." Hatert et al. (2000)
