Crossword Clues for CORUNDUM

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Clue	Source	Date
Mineral of which ruby and sapphire are varieties (8)
Mineral composed of aluminium oxide, the red variety of which is ruby (8)
A crystallised mineral of which ruby and sapphire are varieties (8)
Hard form of aluminium oxide whose red variety is called ruby (8)
Hard mineral form of alumina of which sapphire and ruby are varieties (8)
Mineral almost superfluous in plant stem
Mineral in abrasives	LA Times Daily	02 Sep 2022
Abrasive mineral	The Times Concise	09 Dec 2021
Maybe a ruby from curmudgeon sorry after Georgia's left
It is very hard auditing Telco run dumbly
Brother, not silent presumably, sounding abrasive
Jointly managed depleted uranium and fermium nucleus with this mineral
Very hard mineral used as an abrasive	The Telegraph General Knowledge	22 Feb 2015
An abrasive scrap almost ending company career
Ruby or sapphire
Sapphires and rubies.

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