Calcite from Central Mine, Keweenaw County, Michigan, USA - image 1
Calcite from Central Mine, Keweenaw County, Michigan, USA - image 2

Calcite from Central Mine, Keweenaw County, Michigan, USA

$500.00

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Superb sharp crystals of native copper on a breccia matrix with minor calcite and quartz. There are some tenorite coating upon the native copper crystals. In super condition. A very fine miniature.The Central Mine in Keweenaw County, Michigan, was one of the major copper mines on the Keweenaw Peninsula during the 19th century. Mining began in 1854 when rich deposits of native copper were discovered in amygdaloidal basalt flows of the Portage Lake Lava Series. The mine was operated by the Central Mining Company and became one of the most productive mines in the region during the 1860s and 1870s. Native copper commonly occurred with minerals such as calcite, quartz, and epidote in cavities within the volcanic rock. The mine eventually closed in 1898, and today the site is preserved as part of the Central Mine Historic District.

Product details

SpeciesCalciteQuartzCopper
SizeMiniature
Dimensions4.5 x 3.5 x 2.5 cm
Listed on07/16/2026
LocalityUSA, Michigan, Central Mine
SKU2062040
Current owner
WM
Weinrich MineralsFeatured
3,406 for sale·9 sold

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Calcite
Mineral guide
Learn about Calcite
diverse shapes, colors, and optical quirks; widely available yet scarce elite pieces from Elmwood and Charcas drive collecting value and display.
Calcite
Regional guide
Calcite from Central Mine
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Locality guide
Central Mine
A collector's guide to Central Mine, USA: its geology, mining history and notable minerals, illustrated with the 62 specimens documented from this locality on EarthWonders.