Is this a rock or gemstone?

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February 28, 2015 at 3:15 am #4945
gemdam
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- 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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