CRYSTALS2COLLECT A.C.N 651.525.727 Pty Ltd
ANHYDRITE
ANHYDRITE
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Anhydrite, known as anhydrous calcium sulfate, has the chemical formula CaSO4 and crystallizes in the orthorhombic system, exhibiting perfect cleavage along three symmetry planes. Unlike the orthorhombic sulfates of barium (baryte) and strontium (celestine), it is not isomorphous with them despite similar chemical formulas. Well-formed crystals are relatively uncommon, as the mineral typically appears in cleavage masses. It has a Mohs hardness of 3.5 and a specific gravity of 2.9, with colors ranging from white to shades of grey, blue, or purple. The most developed cleavage exhibits a pearly luster, while other surfaces appear glassy. Anhydrite readily converts to gypsum (CaSO4·2H2O) upon contact with water, and this process is reversible; heating gypsum or calcium sulfate hemihydrate to approximately 200 °C (400 °F) can regenerate anhydrite under normal atmospheric conditions. In vein deposits, anhydrite is often found alongside calcite, halite, and various sulfides, including galena, chalcopyrite, molybdenite, and pyrite.
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Dimensions and Weight
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Dimensions and Weight are mentioned n the product description and will be used during check out to calculate the shipping costs. For example: 55 45 25 127 means Length 55 mm, Width 45 mm, Height 25 mm, Weight 127 grams. The weight is the approximate nett weight of the specimen including the mount (where applicable).
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