Mineral: Pyrite
Locality: Respina Mine, Fuentes de Respina, Puebla de Lillo, Comarca Valle de Boñar, León, Castile and León, Spain
Dimensions: 4 mm. the front edge

Description: ... look at the line dividing the upper pentagon into two trapezoidal halves. They are in fact faces of the diploid. They appear in every 'pentagon' of this crystal, and can be detected mainly because of shining differences.

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