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Selenite, satin spar, desert rose, and gypsum flower are four varieties of gypsum; all four varieties show obvious crystalline structure. The four "crystalline" varieties of gypsum are sometimes grouped together and called selenite.
All varieties of gypsum, including selenite and alabaster, are a very soft mineral (hardness: 2 on Mohs Scale) composed of calcium sulfate dihydrate (meaning has two molecules of water), with the chemical formula CaSO4·2H2O.
The most important identifying characteristic is how soft gypsum is, as any variety of gypsum can be easily scratched with a fingernail. Also because gypsum has natural insulating properties, all varieties feel warm to the touch.
La sélénite est une forme de cristallisation particulière du gypse (sulfate hydraté de calcium, de formule chimique: CaSO4·2H2O) qui se caractérise par sa transparence (ou sa translucidité).
Le nom sélénite provient du latin selenitis qui signifie « pierre de lune », car on dit y voir l'éclat de la lune. Il ne faut cependant pas la confondre avec le feldspath communément appelé pierre de lune.
Elle est aussi nommée « spath satiné » quand elle prend une structure fibreuse
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