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  1. Mineral calcium sulfate, CaSO4, which is gypsum without water.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  2. An orthorhombic mineral, CaSO4 ; massive; primarily in evaporite deposits, hot sulfate volcanic waters, and veins; hydrates to gypsum. Formerly called cube spar.
    Source: Dictionary of Mining, Mineral, and Related Terms

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