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!
Occurs in an oxide mineral assemblage that replaced galena-sphalerite, pyrite & tennantite along a sheared & mineralized fault zone separating limestone & quartzite.
Florence Mine, Ripsey Hill area, Ripsey Mining District, Tortilla Mountains, Pinal County, Arizona, USA