Marcasite

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Blackstone Mine, Upper Mississippi Valley Dist., Lafayette Co., Wisconsin, USA 8x8x10cmMarcasite is an iron sulfide mineral prized by collectors for its metallic luster and distinc tive pale brass-yellow color. This specimen originates from the renowned Blackstone Mine in Wisconsin's Upper Mississippi Valley District, a classic locality celebrated for high-quality marcasite crystals. The cubic and pyritohedral forms typical of this deposit display sharp definition and bright surfaces. At 8×8×10 cm, this is a substantial display piece suitable for serious mineral collections. Marcasite is notably more reactive than its polymorph pyrite, making proper storage and handling important for long-term preservation. A fine example of American mineral heritage from one of the region's most productive historical sources. Show more