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Is this a rock or gemstone?

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gemdam's picture
Joined: 02/28/2015
Posts: 1
Is this a rock or gemstone?
  • Color: black rock
  • Appearance: deep black, smooth, lustrous, reflective, cold, white crystal stripes
  • Shape: tetrahedral, very smooth sides, little craters
  • Hardness: as hard as steel, if not harder
  • Material: crystal feel to the touch
  • Weight: 2 oz

Your comments are appreciated

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