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!
"It makes no sense for there to be dolomite, magnesite or montgomeryite given the complete absence of secondary magnesium at Foote" quoting geologist and Foote Mine collector Kenny Gay.