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black copper

noun — 2 senses

black copper

noun
1

Chemistry, Geography, Geology, Mineralogy, Natural sciences, Physical sciences A mineral form of cupric oxide

2

Engineering, Metallurgy, Natural sciences, Physical sciences Copper with iron and sulfur impurities due to insufficient smelting.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.