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hyperstheneHY'PERSTHENE, n. A mineral, Labrador hornblend, or schillerspar. Its color is between grayish and greenish black, but nearly copper-red on the cleavage. So named from its difficult frangibility. |
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hyperstheneHY'PERSTHENE, n. A mineral, Labrador hornblend, or schillerspar. Its color is between grayish and greenish black, but nearly copper-red on the cleavage. So named from its difficult frangibility. |