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Graphite: C
Comments: A crystal of graphite in gneiss. Location: Forchheim, Pockau, Erzgebirge, Saxony, Germany. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Comments: Black, sub-hexagonal crystal of graphite in calcite. Location: Lead Hill Mine, (near Ticonderoga), Essex Co., New York, USA. Scale: Crystal size 1 mm. © Paul M. Schumacher