JFD37AN7: Geoda de las Monjas ('The Nun's pocket') is an already mythical name in the compendium of fluorite finds from La Viesca. One of the characteristics of this vug, apart from its quality and the enormous sizes of the best pieces, was what gave it its name ('Nuns' because of the shape of their bonnets) due to the relative presence of Quartz epimorphs after scalenohedral Calcite crystals that had disappeared, leaving only the shell of Quartz that used to coat them.
The most desirable epimorphs? Those that also had Fluorite crystals of good size on top of the epimorphs, such as in the case of this piece, which is what makes it such a high-quality specimen.
La Viesca Mine, Las Monjas pocket, La Collada mining area, Huergo, Siero, Comarca Oviedo, Principality of Asturias (Asturias)  Spain (05/2010)

Specimen size: 11 × 8.7 × 8.3 cm = 4.33” × 3.43” × 3.27”

Main crystal size: 4.7 × 4.7 cm = 1.85” × 1.85”