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Hyalite Opal Specimen
showcasing its stunning dragon's blood pattern
First generation: Scalenohedral crystals that are coated with a thin layer of brown iron oxide
complete with charming wings
yet is light enough to be carried in hand
"Fishtail" Selenite / Gypsum Specimen - Sierra Mojada, Mexico thumbnail Hyalite Opal SpecimenSelenite, 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
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US$ 54.00