Corundum                    Mineral Group: OXIDES
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Corundum is the hardest mineral that is easily found in large sizes. Although diamonds are harder, they are very rare. Corundum will scratch almost everything except for diamonds.
The most famous variety of corundum is the ruby.

SPECIMEN ORIGIN: Thunder Bay, Ontario, CANADA
 

 

 


SPECIMEN ORIGIN: INDIA

Ruby


 

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