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| Lumps of Calcium: Some small lumps of calcium. Amount; 0.9 g. |
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| Calcium Ingot: A 10 gramme ingot about 2.5cm square. 99% pure. |
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| Piece of Gypsum: A mineral source of calcium, this variety of fibrous gypsum is called satin spar. This specimen is from Verde Valley, Arizona USA. |