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Selenite, satin spar, desert rose, and gypsum flower are crystal habit varieties of the mineral gypsum.. All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO 4 ·2H 2 O. Selenite contains no selenium, the similar names both derive from Greek selḗnē (σελήνη 'Moon').
Gypsum occurs in nature as flattened and often twinned crystals, and transparent, cleavable masses called selenite. Selenite contains no significant selenium; rather, both substances were named for the ancient Greek word for the Moon. Selenite may also occur in a silky, fibrous form, in which case it is commonly called "satin spar".
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Demesmaekerite is a rare uranium selenite mineral with the chemical formula: Pb 2 Cu 5 (UO 2) 2 (SeO 3) 6 (OH) 6 ·2H 2 O. . It is named after the Belgian mineralogist Gaston Demesmaeker, who worked at the Musonoi Mine in Katanga.
Selenium occurs naturally in a number of inorganic forms, including selenide, selenate, and selenite, but these minerals are rare. The common mineral selenite is not a selenium mineral, and contains no selenite ion, but is rather a type of gypsum (calcium sulfate hydrate) named like selenium for the moon well before the discovery of selenium ...
Selenite minerals (5 P) Pages in category "Selenites" The following 15 pages are in this category, out of 15 total. This list may not reflect recent changes. ...