Spinel
/spɪˈnɛl/
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Definition
(noun) Any of several hard minerals of cubic symmetry that are mixed oxides of magnesium and aluminium and are used as gemstones of various colours.
Sentence Examples
The garnets in the detritus are accompanied by zircon, spinel, corundum, cyanite, tourmaline, olivine, etc.
CEFR Practice Quiz
The gemstone ____ is often mistaken for ruby or sapphire because of its similar and beautiful colors.