"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico septaria Switch on a longwave (365nm)

Switch on a longwave (365nm) UV light

While the demantoid variety gets all the press for its green color

Material: Fluorite

Origin: Malawi

"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico septaria Switch on a longwave (365nm)Selenite, 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