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Corundum

UNB-2017-0038Minerals » Oxides

Description

Euhedral tabular brown sample of Corundum with faint striations. Corundum (Al2O3) can be white, grey, brown to black, deep red (Ruby) or blue (Sapphire). Lustre is vitreous or adamantine and streak is white. Hardness is 9. Corundum can be tapering prismatic crystals or can be pyramidal and tabular. Striations along the crystals faces is common.

Specifications

Object nameCorundum
IDUNB-2017-0038
Legal statusPermanent collection
CategoryMineral
Classification
Mineral group:
Oxides
Composition
  • Cu2O
  • Al2O3
  • CeO2
  • SnO2
  • TiO2
  • Fe3O4
  • FeO(OH)
  • FeTiO3
  • (Y,REE)NbO4
  • ZnFe2O4
  • Fe2O3
  • FeCr2O4
  • FeO
  • CuO
  • Ta2O5
  • (Fe,Mn)(Ta,Nb)2O6
  • MgAl2O4
  • TiO2
  • (Ba,H2O)2(Mn4+,Mn3+)5O10
  • MnO2
  • CaTiO3
  • MgO
  • FeO(OH)·nH2O
  • Al2O3
  • CaO
OriginUnknown
Pieces1
PartialNo
Measurements
  • 2cm x 4cm x 4cm

Publications

  • Chesterman, C.W. 1979. Audubon Society, Field Guide to North American Rocks and Minerals. Knopf.