"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico variscite so the item pictured is

so the item pictured is the item you will be receiving

Size: 47mm x 46mm x up to 10mm thick

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

Locality: Alarcon Mine

"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico variscite so the item pictured isSelenite, 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