Hematite with Calcite

specimen number:
2062378

location:
Commonwealth Mine, Florence Co., Wisconsin, USA

description:
Interesting locality example for the species with sparkling micro crystallized hematite on matrix with calcite. Collected in the middle 1970s.

The Commonwealth Mine, located in Florence County, Wisconsin, was discovered in 1876 by H.D. Fisher and formally opened by the Commonwealth Iron Company around 1880, operating initially for about 11 years before intermittent and related regional mining activities wound down by approximately 1920. Geologically, the deposit sits within the Menominee Iron Range, where high-grade soft hematite and limonite iron ores formed via secondary enrichment, specifically through the oxidation and leaching of Precambrian sedimentary iron formations and interlayered iron-bearing carbonate and silicate strata.

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