copper pyrites

American  

noun

Mineralogy.

1. chalcopyrite.

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copper pyrites British  

/ ˈpaɪraɪts /

noun

1. (functioning as singular) another name for chalcopyrite

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Etymology

Origin of copper pyrites

First recorded in 1770–80

Example Sentences

Beat with a stone on copper pyrites, and it immediately begins to crumble.

From Project Gutenberg

In the first are found veins of calcite and quartz from half-an-inch to three inches thick, in which especially in the calcite the gold is visible mixed with iron and copper pyrites, galena and blende.

From Project Gutenberg

Magnetic pyrites, copper pyrites, zinc blende and arsenical pyrites are other and less important examples, the last constituting the gold ore formerly worked in Silesia.

From Project Gutenberg

The substance used for the purpose was copper pyrites, which was changed to an impure sulphate of copper by the action of oil of vitriol and moist air.

From Project Gutenberg

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

From Project Gutenberg