University of Colorado

Mineral Structure and Property Data

Rutile Group

The Rutile group is composed of the rutile-structure di-oxide minerals of titanium (rutile), silicon (stishovite), manganese (pyrolusite), and tin (cassiterite). The fluoride mineral sellaite (MgF2) also has this structure.

The crystal structure of rutile. 

                Rutile      Stishovite  Pyrolusite  Cassiterite 
                TiO2        SiO2         MnO2        SnO2


Form.Wt.        79.890      60.086      86.94       150.69   
Z               2           2           2           2       
CrystalSystem   Tet         Tet         Tet         Tet     
PointGroup      4/mmm       4/mmm       4/mmm       4/mmm
SpaceGroup      P42/mnm     P42/mnm     P42/mnm     P42/mnm     

UnitCell
a(Å)            4.5845      4.1790      4.396       4.737
c(Å)            2.9533      2.6651      2.871       3.185
Vol(Å3)         62.07       46.54       55.48       71.47   

MolarVol        18.693      14.017                  21.523
Density         4.2743      4.287       5.203       7.001

Thermal Expansion(Volumetric)
alpha           28.9        16.4
a0              0.2890      0.1574
a1              0.0000      0.7886
a2              0.0000      -0.1500

Elastic Properties
Ks(GPa)         215.5       316.                    212.3 
G(Gpa)          112.4      220.                    101.8

Mineral Data Base Index

GEOL 1010 Syllabus

GEOL 3010 Syllabus

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