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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