RX64H8: Excellent thumbnail, very representative for the locality. Free of alteration, it has no real crystals (as frequently happens on this species) but shows a parallel polysynthetic growth of the Bismuth that forms a kind of feather. The specimen has a small matrix of Quartz. It is from a mine that closed a long time ago.
La Espuela de San Miguel Mine, Villanueva de Córdoba, Comarca Los Pedroches, Córdoba, Andalusia  Spain

Specimen size: 1.6 × 1.6 × 2.2 cm = 0.63” × 0.63” × 0.87”