"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico Pyramid rusty browns

rusty browns

one piece may display broad patches of sky blue accented by bold white lines

making it a unique and valuable addition to any collection

These also have varying UV reaction with long-wave/mediun-wave/short-wave

"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico Pyramid rusty brownsSelenite, 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