Calcite, Marcasite, Pyrite
Conco Mine, North Aurora, Kane County, Illinois, USA
A miniature cluster of mostly translucent, gray calcite scalenohedral points, with sparkling, metallic pyrite or marcasite inclusions. Individual calcites reach about 1.4 cm. The inclusions are closer to the surfaces than the cores of the calcites, suggesting deposition late in the calcite growth.
© Steve Hardinger and Dragon Minerals