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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').
A selenate selenite is a chemical compound or salt that contains selenite and selenate anions (SeO 3 2-and SeO 4 2-). ... orange yellow [16] Hg 3 (SeO 3) 2 (SeO 4) 1:2
Bedford and Cavor break out of captivity beneath the surface of the Moon and flee, killing several Selenites. In their flight they discover that gold is common on the Moon. In their attempt to find their way back to the surface and to their sphere, they come upon some Selenites carving up mooncalves but fight their way past.
Selenite minerals (5 P) This page was last edited on 22 May 2019, at 02:17 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 ...
In 1999, a mineralogist group discovered a cave filled with giant selenite (gypsum) crystals in an abandoned silver mine, Mina Rica, near Pulpi, Province of Almeria, Spain. The cavity, which measured 8.0 by 1.8 by 1.7 metres (26.2 ft × 5.9 ft × 5.6 ft), was, at the time, the largest crystal cave ever found.
Iceland spar holds historical importance in optics and the study of light. [18] One of its most notable properties is its ability to exhibit double refraction. [18] This phenomenon was first described by the Danish scientist Erasmus Bartholin in 1669, who observed it in a specimen of Iceland spar.