Copper pyrites sentence example

copper pyrites
  • Old schists, free from fossils and rich in quartz, overlie it in parallel chains through the whole length of the peninsula, especially in the central and highest ridges, and bear the ores of Chu-goku (the central provinces), principally copper pyrites and magnetic pyrites.

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  • From copper-pyrites (chalcopyrite) iron-pyrites is distinguished by its superior hardness and by its paler colour.

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  • An extremely important variety of pyrites is that which is more or less cupriferous, and is commonly known commercially as "copper-pyrites" (q.v.), though distinct mineralogically from that mineral.

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  • The name copper-pyrites is from the Ger.

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  • By the ancients copper-pyrites was included with other minerals under the term pyrites, though the copper-ore from Cyprus referred to by Aristotle as chalcites may possibly have been identical with this mineral.

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  • Calcination is only advisable for ores which contain relatively much iron pyrites and little copper pyrites.

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  • If it contains more than 55% of copper it is directly refined, while if it contains a lower percentage it is smelted with matte or calcined copper pyrites.

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  • Iron disulphide, FeS2, constitutes the minerals pyrite and marcasite; copper pyrites is (Cu, Fe)S2.

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  • Sometimes the carbonized fragments of plants have been replaced by copper pyrites.

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