selenite

selenite

A small, clear selenite crystal rests on a geologist's open field notebook.

Definition
  1. Noun:
    • A mineral form of gypsum: "selenite" is a crystalline variety of the mineral gypsum (calcium sulfate dihydrate), typically colorless and transparent, often occurring in thin, flat, tabular crystals.
    • A lunar inhabitant (rare or poetic): "selenite" can also refer to a hypothetical or imaginary inhabitant of the Moon, derived from the Greek word selene (moon).
Usage Examples

  • Mineral sense:

    • The museum displayed a large, clear crystal of selenite. (A transparent form of gypsum.)
    • Selenite is often used in decorative items due to its translucent appearance. (A mineral used for ornamentation.)

  • Lunar inhabitant sense:

    • In science fiction, a selenite might be depicted as a creature living on the Moon. (A fictional Moon dweller.)
    • The ancient Greeks imagined selenites as beings made of pure light. (Imaginary lunar inhabitants.)
Advanced Usage

  • "Selenite window": a thin, transparent sheet of selenite used historically as a substitute for glass.

    • In medieval churches, selenite windows allowed soft light to filter through. (Thin gypsum sheets used as window panes.)

  • "Selenite desert": a region where selenite crystals are abundant, such as the White Sands in New Mexico.

    • The selenite desert glistened under the sun. (A landscape covered in gypsum crystals.)
Variants and Related Words

  • Selenitic (adj): relating to or containing selenite.

    • The selenitic soil was rich in gypsum deposits. (Soil containing selenite.)

  • Selenology (n): the scientific study of the Moon.

    • Selenology includes the analysis of lunar rocks and selenite formations. (Moon study.)
Synonyms
  • Gypsum: a common mineral of which selenite is a variety.
  • Moonstone: a different mineral (feldspar) with a similar name but distinct properties; not a true synonym.
Related Idioms (None directly common, but poetic usage may appear)
  • "Selenite dream": a poetic phrase for a vision or fantasy related to the Moon.
    • He had a selenite dream of walking on the lunar surface. (A moon-inspired dream.)
Additional Notes
  • In mineralogy, selenite is distinguished from other gypsum varieties (e.g., alabaster, satin spar) by its clear, crystalline structure.
  • The term "selenite" for a lunar inhabitant is now largely obsolete, replaced by "lunar dweller" or "Moon person."