Selenite, satin spar, desert rose, gypsum flower are crystal habit varieties of the mineral gypsum.
All varieties of gypsum, including selenite and alabaster, are composed of calcium ...
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sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO4·2H2O. Selenite contains no significant selenium – The similar names both derive from Greek selḗnē (σελήνη ´Moon´).
Some of the largest crystals ever found are of selenite, the largest specimen found in the Naica Mine´s Cave of the Crystals being 12 metres long and weighing 55 tons.