Puneet Varma (Editor)

Native copper

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Category  Native metal
Strunz classification  01.AA.05
Crystal system  Cubic
Formula (repeating unit)  Cu
Dana classification  1.1.1.3
Native copper FileNative Copper Macro Digon3cropjpg Wikimedia Commons
Crystal class  Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m)

Native copper


Native copper is an uncombined form of copper which occurs as a natural mineral. Copper is one of the few metallic elements to occur in native form, although it most commonly occurs in oxidized states and mixed with other elements. Native copper was an important ore of copper in historic times and was used by pre-historic peoples.

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Native copper Native Copper WhatAEarth

Native copper occurs rarely as isometric cubic and octahedral crystals, but more typically as irregular masses and fracture fillings. It has a reddish, orangish, and/or brownish color on fresh surfaces, but typically is weathered and coated with a green tarnish of copper(II) carbonate (also known as patina or verdigris). Its specific gravity is 8.9 and its hardness is 2.5–3.

Native copper Native Copper

The mines of the Keweenaw native copper deposits of Upper Michigan were major copper producers in the 19th and early 20th centuries, and are the largest deposits of native copper in the world. Native Americans mined copper on a small scale at this and many other locations, and evidence exists of copper trading routes throughout North America among native peoples, proven by isotopic analysis. The first commercial mines in the Keweenaw Peninsula (which is nicknamed the "Copper Country" and "Copper Island") opened in the 1840s. Isle Royale in western Lake Superior was also a site of many tons of native copper. Some of it was extracted by native peoples, but only one of several commercial attempts at mining turned a profit there.

Native copper httpsuploadwikimediaorgwikipediacommonsthu

Another major native copper deposit is in Coro Coro, Bolivia.

The name copper comes from the Greek kyprios, "of Cyprus", the location of copper mines since pre-historic times.

World s largest native copper


  • Specimens from notable native copper localities worldwide

  • Native copper Native Copper Mineral For Sale Fossilicious
    Native copper FileNative Copper mineraljpg Wikimedia Commons

    References

    Native copper Wikipedia


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