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!
This Colorado type species is an oxidation product of other vanadium minerals and occurs as dark blue-black crystals that coat fracture surfaces and partings in sandstones or along fractures in coalified wood. It is commonly associated with native seleni