University of Colorado

Mineral Structure Data

Periclase Group

The periclase group is composed of the mon-oxide minerals of magnesium (periclase), iron (wustite), calcium (lime), manganese (manganosite) and nickel (bunsenite).

The crystal structure of periclase. The crystal structure is that of halite (rocksalt) and is composed of two interpenetrating FCC lattices of cation and oxygen. Both cations and anions are in octahedral (6) coordination. 

                Periclase   Wustite     Lime        Bunsenite   Manganosite
                MgO         FeO         CaO         NiO         MnO


Form.Wt.        40.312      71.848      56.079      74.709      70.937
Z               4           4           4           4           4     
CrystalSystem   Cub         Cub         Cub         Cub         Cub        
PointGroup      m3m         m3m         m3m         m3m         m3m 
SpaceGroup      Fm-3m       Fm-3m       Fm-3m       Fm-3m       Fm-3m      

UnitCell
a(Å)            4.211       4.3108      4.1684      4.446       4.8105
Vol             74.67       80.11       111.32      72.43       87.88

MolarVol        11.244      12.062      16.762      10.906      13.223 
Density         3.585       5.956       3.346       6.850       5.365

Thermal Expansion(Volumetric)
alpha           31.6        33.9        33.5                    34.5
a0              0.3768      0.3203      0.3032                  0.3317
a1              0.7404      1.4836      1.0463                  1.2055
a2              -0.7446     -0.0000     0.0000                  -0.2094

Elastic Properties
Ks(GPa)         162.7       181.4       114.7                   153.0
G(Gpa)          131.1       46.1        81.2                    68.1

Mineral Data Base Index

GEOL 1010 Syllabus

GEOL 3010 Syllabus

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