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Appreciated for its qualities of durability, lamp icon ductibilitat (it's easy to stretch) and malleability (can be work sheets). Copper is a metal and has been present throughout human history and in most of its prehistory.
Keweenaw Peninsula, north of the state of Michigan in the Great Lakes Region of the United States has provided some of the best known examples of native copper. The Museum of Natural Science, in his collection of mineralogy, canned whole picture.
Copper from Keweenaw is a rare anomaly in which metallic copper is almost always present in the native state (not combined with other chemicals lamp icon (such as sulfur or oxygen.) The copper deposit is fitted in rocks of Precambrian lamp icon age, mainly sandstones, conglomerates and basalt lava.
With the decline lamp icon of the mining premises, which had been flourishing some localities has been gradually lamp icon abandoned, although some have been included in the Keweenaw National Historical Park and restored, others have languished forever. Some of the most famous mines in the district have adequate open as a tourist attraction.
Eagle Harbor, Keweenaw, Michigan, USA 11953 MGB (col. brain) Size: 7.5 x 7.1 x 2.1 cm / crystal pral.: 2.1 x 1.7 x 1.7 cm / Weight: 213 , 8 g Added tetrahexahèdrics crystal faces and edges defined
For further information (publications available from the Museum Library) Bancroft, P. 1984. Gem and crystal treasures. The Mineralogical Record - Western Enterprises. 488 p. Fallbrook, California. Heinrich, EW, Robinson, GW 2004. Mineralogy of Michigan. AE Seaman Mineral Museum / Michigan Technological University. 252p. Houghton, Michigan. McFall, RP 1983. Cooper Michigan country. Rocks & Minerals. 58 (3): 121-124. Wilson, WE, Dyl, SJ 1992. Cooper The Michigan country. The Mineralogical Record. 23 (1): 1-72.
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