WHITE-PYRITE, WHITE-PYRITES, noun [white and pyrite.] An ore of a tin-white color, passing into a brass-yellow and steel-gray, occurring in octahedral crystals, sometimes stalactitical and botryoidal. It contains 46 parts of iron, and 54 of sulphur.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.