"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico variscite Locality: Alarcon Mine

Locality: Alarcon Mine

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The distinctive layers were formed in ancient oceans as dissolved iron reacted with oxygen produced by early microorganisms (cyanobacteria)

"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico variscite Locality: Alarcon MineSelenite, a type of gypsum, is a hydrous calcium sulfate (CaSO42H2O) that forms monoclinic crystals with prismatic or bladed shapes and distinct rhombic appearance. It can also be found as arrowhead shaped twins with beveled edges. While pure selenite is colorless or white, impurities can result in shades of pale gray, yellow, red, and brown. With a hardness of 1. 5 2. 0, selenite is transparent to translucent and has a vitreous to pearly luster. It