Plural form of gypsum; multiple deposits, samples, or types of the mineral calcium sulfate dihydrate.
From Latin 'gypsum,' from Greek 'gypsos,' likely borrowed from a Semitic language; the plural simply adds English '-s' to the singular mineral name.
Gypsum exists in fascinating varieties—from selenite crystals so clear you can read through them, to alabaster statues, to the humble drywall in your bedroom—all the same mineral, different forms!
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