This mine is very well known worldwide as producing exceptional fluorites. It is located in the North of Spain and has been in and out of operation for many decades.
"Crystals from the La Viesca open pit at La Collada show some variation in that the beveling dodecahedron faces are more smooth rather than rough, and the dominant color is blue to lilac and less intense. Color zoning is common, and fluorescence is absent. A peculiarly lustrous bubbly texture on the cube faces is another distinguishing aspect of some specimens, as is the association with quartz rather than calcite."
(1992). Fluorite and Associated Minerals from Asturias, Spain. The Mineralogical Record, 23(January-February), 73.
Most of the fluorite specimens from this mine, and this region, have interesting modifications to the crystal edges. This specimen has large clear cubes of fluorite, with glass-like luster in a sky blue to pale purple color. The crystals are stacked upon a silvery gray sparkling matrix of drusy quartz. The fluorites form a half circle at the base and directly in the center is an isolated three dimensional fluorite crystal. This piece possesses the qualities of the very best from the La Viesca Mine.
*Two minor corners along the bottom have been professionally restored