Pyrite
Dongchuan Cu ore field, Dongchuan District, Kunming, Yunnan, China
5.7 x 4.8 x 3.4 cm. The bright, sparkling, sharp, modified, metallic Pyrite crystals have formed unique intergrown somewhat spherical groups which are isolated on an "egg-shaped" ball of shale. It's actually rather different from the majority of the Pyrite concretions I've seen from this area, which typically form "rings" of Pyrite instead of ...
© Rob Lavinsky & irocks.com