Selenite meaning

sĕlə-nīt, sĭ-lē-
Gypsum in the form of colorless clear crystals.
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A kind of gypsum found in transparent crystals.
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A salt of selenous acid containing the divalent, negative radical SeO3
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(mineralogy) A soft, glassy form of gypsum (chemical formula CaSO4·2H2O).
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(inorganic chemistry) The anion SeO32− derived from selenous acid; any salt or ester of selenous acid.
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Origin of selenite

  • Latin selēnītēs from Greek selēnītēs (lithos) moon (stone), selenite (so called because it was believed to wax and wane with the moon) from selēnē moon selenium

    From American Heritage Dictionary of the English Language, 5th Edition