selenite

n. [ L. selenites, Gr. &unr_;&unr_;&unr_;&unr_; (sc. &unr_;&unr_;&unr_;), from selh`nh the moon. So called from a fancied resemblance in luster or appearance to the moon. ] (Min.) A variety of gypsum, occuring in transparent crystals or crystalline masses. [ 1913 Webster ]