The industrial term "emery" describing Corundum abrasives is derived from the variety Emery which is mined specifically for its use as an abrasive. These are fairly common forms, and due to their great hardness and prevalence are the most favorable abrasives.
Translucent brown Corundum and Emery are the most common forms of Corundum. It is also unaffected by acids and most environments. For all practical purposes, it is the hardest mineral after Diamond, making it the second hardest mineral. Sapphire is also only used to describe the gem variety otherwise it is simply called Corundum.Ĭorundum is a very hard, tough, and stable mineral. Ruby is the red variety, and Sapphire is the variety that encompasses all other colors, although the most popular and valued color of Sapphire is blue. Ruby and Sapphire are scientifically the same mineral, but just differ in color. Corundum is best known for its gem varieties, Ruby and Sapphire.
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