Английская Википедия:Adamantine spar
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Шаблон:Short description Шаблон:About
Adamantine spar is a silky brown variety of corundum. It has a hardness of 9 on the Mohs scale.[1]
See also
References
Шаблон:Short description Шаблон:About
Adamantine spar is a silky brown variety of corundum. It has a hardness of 9 on the Mohs scale.[1]