Hinsdalite

specimen number:
2354253

location:
Golden Fleece Mine, Lake Co., Colorado, USA

description:
Waxy slightly translucent massive yellowish green hindsalite 0.3 cm across on matrix. From the type locality. The specimen comes with a previous label from the collection of Jack Nieburger.

The Golden Fleece Mine, located near Lake City in Hinsdale County, Colorado, sits within the rugged volcanic terrain of the San Juan volcanic field, specifically associated with radial faulting and fracture systems tied to the Lake City caldera. Originally located in 1874 by Enos Throop Hotchkiss, the mine developed a rich history of underground extraction targeting high-grade gold, silver, and telluride ores that significantly boosted the local mining economy. This historic locality is famously recognized as the type locality for hinsdalite, an uncommon secondary sulfate-phosphate mineral containing lead, aluminum, and strontium that typically forms in altered volcanic host rocks through hydrothermal activity and surface weathering.

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