Fluorite with Quartz, Chalcopyrite

specimen number:
9505656

location:
La Viesca mine, Huergo, Siero, Asturias, Spain

description:

Beautiful cluster of blue glassy and gemmy cubic fluorite crystals measuring to 3.5 cm on edge, this with minor quartz. Golden crystals of chalcopyrite are scattered throughout. The specimen is in super condition.

The La Viesca Mine, situated in Huergo within the famous La Collada mining area of Siero, Asturias, Spain, has a rich history tied to intensive spar and fluorite extraction that developed significantly during the 19th and 20th centuries. Geologically, the deposit is part of the Asturian Mesozoic basin, where mineralization occurs primarily as veins and stratabound bodies hosted within Carboniferous limestones and Permo-Triassic red-bed sediments or calcareous breccias. These hydrothermal deposits formed through the circulation of fluorine-rich fluids controlled by regional tectonic fractures. Mineralogically, La Viesca is world-renowned among collectors for producing some of the finest fluorite specimens ever discovered, celebrated particularly for their striking deep blue, violet, or zonal coloration, exceptional transparency, and frequent association with quartz crystals.

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