Selenite
Selenite , noun
(Chemistry) A salt of selenious acid.
Selenite , noun
[Latin selenites, Greek {not transcribed} (sc. {not transcribed}), from selh`nh the moon. So called from a fancied resemblance in luster or appearance to the moon.]
(Mineralogy) A variety of gypsum, occuring in transparent crystals or crystalline masses.