Adamantine spar
Adamantine spar is a silky brown variety of corundum. It has a hardness of 9 on the Mohs scale.[1]
See also
References
- ^ "Adamantine Spar". Archived from the original on 18 October 2007. Retrieved September 15, 2007.
Adamantine spar is a silky brown variety of corundum. It has a hardness of 9 on the Mohs scale.[1]
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