Selenite

n. [Fr. sélénite, Lat. selenites, Gr. σεληνίτης (sc. λίθος), from σελήνη, the moon;—so called from a resemblance in luster or appearance to the moon.]

1. (Min.) A variety of sulphate of lime or gypsum, occurring in transparent crystals, or crystalline masses. Dana.
2. (Chem.) A compound of selenious acid with a base.