Adamantine spar

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

This article is about the real mineral. For mythological and fictional substances of a similar name, see Adamant. For the type of mineral lustre, see Adamantine lustre.

See also

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


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