Large cubic crystal with dodecahedral beveling, transparent and showing well-defined geometric color zoning, with hues ranging from intense blue to lilac and violet.
The specimen comes from material collected over many years by Fernando Brugos, former owner of the La Viesca claim. This material was carefully documented, with the different pockets and the dates of the finds accurately recorded.
Geologically, the fluorites from La Viesca formed in hydrothermal cavities related to mineralized fractures cutting Carboniferous limestones. Variations in trace-element content and growth conditions during crystallization produced the distinctive geometric color zoning that characterizes some of the specimens from the locality.
La Viesca Mine, Las Calcitas pocket, La Collada mining area, Huergo, Siero, Comarca Oviedo, Principality of Asturias (Asturias) Spain (02-05/2007)
Specimen size: 10 × 8.4 × 5.8 cm = 3.94” × 3.31” × 2.28”
Main crystal size: 8.6 × 8.1 cm = 3.39” × 3.19”
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