Adamantine spar

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.
Adamantine spar
General
CategoryMinerals
FormulaAl2O3
Identification
ColorBrown
Mohs scale hardness9
LusterSilky

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

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