University of Colorado

Mineral Structure and Property Data

Dolomite Group

The dolomite group is composed of the rhombohedral carbonates dolomite (CaMg(CO3)2) and ankerite (CaFe(CO3)2).

The crystal structure of dolomite. 

                
                Dolomite    Ankerite
                (CaMg(CO3)2)  (CaFe(CO3)2). 


Form.Wt.        
Z               3           3     
CrystalSystem   Trig        Trig  
PointGroup      -3          -3    
SpaceGroup      R-3         R-3   

UnitCell
a(Å)            4.8069      4.830  
c(Å)            16.0034     16.167  
Vol(Å3)         320.24      326.63

MolarVol        64.293      65.576    
Density         2.868       3.293    

Thermal Expansion(Volumetric)
alpha           22.8                
a0              0.11928 
a1              3.1703 
a2              -0.5393

Elastic Parameters
Ks(GPa)        94.9 
G(GPa)          45.7
Mineral Data Base Index

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