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!
Cooper & Stanley (1990): "In small amounts as encrustations with beudantite and scorodite from an old dump at, or near, the junction of the Deer Hills Quartz lode and the Potts Gill baryte lode [NY31453626] (det. BM(NH): XRD, N. Thomson, pers. comm.)."
Deer Hills, Caldbeck, Allerdale, Cumbria, England, UK