emery

1. A hard grey-black mineral consisting of corundum and either hematite or magnetite;
   Used as an abrasive (especially as a coating on paper) (synset 114698304)
   is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
   substance holonym:

   • corundom, corundum - very hard mineral used as an abrasive
   • haematite, hematite - the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form
   • magnetic iron-ore, magnetite - an oxide of iron that is strongly attracted by magnets
   substance meronym: emery paper, sandpaper - stiff paper coated with powdered emery or sand

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