Corundom

Of mineral and emery.   May also be referred to as corundum.

Very hard mineral used as an abrasive.

This concept's ID is @1~74071

Transparent Gem

  • sapphire 1 facts

    A precious transparent stone of rich blue corundum valued as a gemstone.

  • ruby 0 facts

    A transparent deep red variety of corundum; used as a gemstone and in lasers.

Also contains

  • alumina 1 facts

    Any of various forms of aluminum oxide occurring naturally as corundum.