Alumina is characterized as a white, powdery substance produced from bauxite by a chemical process during which aluminum oxide is extracted from the ore. Between four and five tonnes of bauxite are required to produce about two tonnes of alumina, which yield one tonne of aluminum.

-see also:
"Alumina" is in the NAICS Code "33131"
  Alumina and Aluminum Production and Processing

"Alumina" is in the CPC Code "41432"
  Alumina (aluminium oxide), except artificial corundum

"Alumina" is in the UNSPSC Code "12352311"