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Gypsum is named from Greek "gypsos" - plaster, alluding to its practical use. It has been known from antiquity. Gypsum is composed of hydrated calcium sulphate and takes many forms, occurring as tabular, bladed and diamond shaped crystals.
Measures approx 4.00' x 4.00" x 2.50" and weighs approx 266 grams
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