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(Minerals) a red transparent variety of spinel, used as a gemstone
a deep red, transparent variety of spinel, used as a gem.
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|Noun||1.||ruby spinel - a spinel used as a gemstone (usually dark red)|
spinel - a hard glassy mineral consisting of an oxide of magnesium and aluminum; occurs in various colors that are used as gemstones
almandine - a purple variety of the ruby spinel
rubicelle - a yellow or orange variety of ruby spinel