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

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