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барилгын үйлдвэрлэлийн кальцит
Кальцит Драгоценные Камни . 2022 3 29 Calcite is a carbonate mineral and is the most stable form of calcium carbonate one of the most common minerals on earth With a hardness of only 3 on the Mohs scale it can only be used in jewelry that won t be subjected to knocks or scratches such as earrings and pendants s hardness is similar to that of …
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