Rhodochrosite with Quartz “casts” after Anhydrite / Locality - Sunnyside Mine, near Gladstone, San Juan County, Colorado


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The Sunnyside Mine was one of the most prolific localities in the history of San Juan mining, producing over $150 Million in total metals over the course of its life. In addition to the tremendous amounts of Gold and other metals that came out of the Sunnyside, it provided collectors with some of the most distinctive and memorable display specimens from any locality in southwestern Colorado. This mine is probably best known for its amazing pink Rhodochrosite specimens, but it also produced some of the most distinctive “casts” from any ore body deposit in Colorado. This piece features several soft pink color rhombohedra of Rhodochrosite which are coated by a thin layer of crystalline Quartz. Additionally, the Quartz has formed somewhat blocky, sculptural, geometric hollow cavities or “casts” after preexisting Anhydrite. This phenomenon is seen throughout the Sunnyside Mine, and definitely looks even better when associated with Rhodochrosite.

Locality: Sunnyside Mine, near Gladstone, San Juan County, Colorado

Specimen Size: 3.3 x 2.3 x 1.6 cm (miniature)
Largest Crystal: 1.6 cm

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