HY'PERSTENE
HY'PERSTHENE, noun 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.
Webster's Dictionary 1828
HY'PERSTENE
HY'PERSTHENE, noun 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.