Selenite is mostly synonymous with gypsum, but from the 15th century, it has been named the transparent variety that occurs in crystals or crystalline masses. The name derives through Middle English selenite from Latin selenites, ultimately from Greek selēnítēs líthos (σεληνίτης λίθος, lit. 'moon stone'). It got this name because people historically believed the mineral waxed and waned with the cycles of the Moon.
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