This anorthite or bytownite crystal is from the Dorado Mine in Casas Grandes, Chihuahua, Mexico. This is one of a few mines in which this gem variety of feldspar is found. It is a silicate that contains the elements Ca, Al. Si and O. This crystal Has a well defined habit for the species with several evident prism faces. It has a transparent interior with a frosty luster. It is a small miniature that measures 26 x 15 x 14 mm. It weighs 36 carats.