Corundum is a mineral of: (a) Calcium (b) Gold (c) Iron (d) Aluminium
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Corodum is a mineral of Aluminium.
It is an alkaline form of aluminium oxide.
It is a very hard mineral and is next to diamond.
It is known for its gem varieties Ruby and Saphire.
It also is unaffeted by the environment and acids.
The most common forms are Eremy nad Corodum.
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