Copper Pyrites
Hawkins' Electrical Dictionary · 1915 · p. 3
—The commonest ore of copper, a double sulphide of copper and iron, sometimes containing some arsenical sulphide in addition:
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The American Dictionary and Cyclopedia (1910)
Copper-pyrites
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Nuttall's Standard Dictionary of the English Language (1890)
Zell's Condensed Dictionary (1879)
Copper
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A Dictionary of Scientific Terms (1927)
COPPER
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Adair's New Encyclopedia (1923)
Pyrites
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A Dictionary of Military Terms (1918)
Copper
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French-English and English-French Commercial Dictionary (1918)
COPPER
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A Vocabulary of Criminal Slang (1915)
Copper
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Hawkins' Electrical Dictionary (1915)
Pyrites
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Hawkins' Electrical Dictionary (1915)
Copper
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The Slang Dictionary Etymological Historical and Anecdotal (1913)
copper
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The American Illustrated Medical Dictionary (1913)
Copper
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Everybody's Encyelopedia (1912)
Copper
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Chamber's Twientieth Century Dictionary (1908)
Pyrites
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Chamber's Twientieth Century Dictionary (1908)
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