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Which Mineral Is A Crystalline Form Of Aluminium Oxide, Typically Containing Traces Of Iron, Titanium, Vanadium, And Chromium? This Mineral Has Two Primary Gem Varieties: Ruby And Sapphire.

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1. Which Mineral Is A Crystalline Form Of Aluminium Oxide, Typically Containing Traces Of Iron, Titanium, Vanadium, And Chromium? This Mineral Has Two Primary Gem Varieties: Ruby And Sapphire.





 
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