Adamantine spar
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Adamantine spar is a silky brown variety of corundum. It has a hardness of 9 on the Mohs scale.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Template:Short description Template:About
Adamantine spar is a silky brown variety of corundum. It has a hardness of 9 on the Mohs scale.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>