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