Adamantine spar

Variety of corundum

Adamantine spar is a silky brown variety of corundum. It has a hardness of 9 on the Mohs scale.[1]

See also

  • Yogo sapphire

References

  1. ^ "Adamantine Spar". Archived from the original on 18 October 2007. Retrieved September 15, 2007.


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