Anorthite (Var: Bytownite)
Dorado Mine, Casas Grandes Municipality, Chihuahua, Mexico
This is a rare crystalline example of bytownite, a calcium-rich plagioclase feldspar mineral. The crystal, gemmy throughout, is subhedral with glassy to frosted faces. As bytownites go, this crystal is well-formed and very uncommon, as this gem variety is normally only seen as facet rough and almost never as a crystallized specimen. This 2.8 cm ...
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