"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico variscite This variety of gypsum

This variety of gypsum

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

5in x 5in x 2in

it is a stunning addition to any collection

"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico variscite This variety of gypsumSelenite, 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