Oxides Tetrahedral oxides – four-fold coordination

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Presentation transcript:

Oxides Tetrahedral oxides – four-fold coordination Octahedral oxides – six-fold coordination Mixed octahedral and tetrahedral coordination Cubic oxides – eight-fold coordination Mixed cubic and cube-octahedral oxides – twelve-fold coordination Oxides with unusual coordination

Tetrahedral oxides The only common mineral is zincite, ZnO, which has the wurtzite structure.

Periclase (MgO) has the halite structure. Octahedral Oxides Periclase (MgO) has the halite structure.

The hematite group Minerals in this group are based on the general formula X2O3 with hexagonal close- packed structure where 1/3 of the octahedral voids are vacant.

corundum corundum Al2O3

Hematite-type structure corundum corundum

Hematite, variety specularite, or specular hematite

Ilmenite (FeTiO3)

hematite hematite ilmenite

Rutile group The rutile group is based on the general formula XO2 .

rutile TiO2

Cassiterite (SnO2) The rutile structure

Pyrolusite (MnO2)

columbite-tantalite, so-called “coltan” (Fe,Mn)Nb2O6- (Fe,Mn)Ta2O6

Mixed octahedral and tetrahedral coordination Spinel group XY2O4 X = 2+,Y = 3+ Inverse Normal XY2O4 Y[XY]O4 chromite magnesiochromite hercynite galaxite franklinite magnetite magnesioferrite jacobsite spinel ulvospinel

Spinel (MgAl2O4)

Fe3+[Fe2+Fe3+]O4

chromite (FeCr2O4)

franklinite (ZnFe2O4)

chrysoberyl (BeAl2O4)

Cubic oxides Uraninite UO2 has the flluorite structure.

uraninite (UO2)

Mixed Octahedral and Cuboctahedral Oxides perovskite CaTiO3

Ti in octahedral (6-fold) coordination Ca in cuboctahedral (12-fold) coordination

Oxides with Unusual Coordination

cuprite (Cu2O)