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 pegmatite. Sauer (1982): "The main discovery was made at the beginning of 1970 in Córrego do Urucum, in Minas Gerais. An immense geode was coated with kunzite and morganite crystals, the latter weighing more than ten kilogrammes apiece."
Urucum claim, Barra do Cuieté, Conselheiro Pena, Minas Gerais, Brazil