Diaspore
The mineral species behind the gem — aluminium oxide hydroxide, α-AlO(OH), orthorhombic, first described in 1801. Most diaspore is ore-grade; only a transparent, colour-changing fraction is cut as a gem.
The mineral species behind the gem — aluminium oxide hydroxide, α-AlO(OH), orthorhombic, first described in 1801. Most diaspore is ore-grade; only a transparent, colour-changing fraction is cut as a gem.
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