Anhydrite tumblestone
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This mineral is closely related to gypsum and is an anhydrous calcium sulphate.
It is an evaporate mineral and occurs in a global list of locations, frequently in association with other evaporates such as halite and calcite.
Average weight, 11g. All prices are per item. Photographs are representative of the items on offer, but the item you buy may not be the one in the photograph