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!
Green et al. (2009): "Wulfenite is present on a specimen [in the Kingsbury Collection, BM(NH)] that is broken into numerous pieces, with many tiny fragments stored in a glass tube. The matrix is a heavily limonitic, hackly, porous, quartz gossan which is coated in velvety lime green acicular pyromorphite needles. In amongst and on top of these, there are abundant bipyramidal crystals of bright red wulfenite, the largest about 0.6 mm across. The specimen is not from Ingray Gill and does not appear to be dump collected.
