University of Colorado
Mineral Structure Data
Aluminosilicate Group
The aluminosilicate group is composed of minerals of the general formula
Al2SiO5
The crystal structure of sillimanite.
The crystal structure of andalusite
The crystal structure of kyanite
The crystal structure of topaz
Sillimanite Andalusite Kyanite Topaz
Al2SiO5 Al2SiO5 Al2SiO5 Al2SiO4(F,OH)2
Form.Wt. 162.05 162.05 162.05 182.0
Z 4 4 4 4
CrystalSystem Orth Orth Tric Orth
PointGroup mmm mmm -1 mmm
SpaceGroup Pbnm Pnnm P-1 Pbnm
UnitCell
a(Å) 7.4883 7.7980 7.1262 4.6651
b(Å) 7.6808 7.9031 7.8520 8.8381
c(Å) 5.7774 5.5566 5.5747 8.3984
alpha 89.99
beta 101.11
gamma 106.03
Vol(Å3) 332.29 342.44 293.72 346.27
MolarVol 50.035 51.564 44.227 52.140
Density 3.2386 3.1426 3.6640 3.492
Thermal Expansion(Volumetric)
alpha 13.3 22.8 25.1 14.8
a0 0.1260 0.2181 0.2505 0.1098
a1 0.2314 0.3261 0.0 1.2700
a2 0.0 0.0 0.0 0.0
Elastic Properties
Ks(GPa) 170.8 162. 193. 167.4
G(Gpa) 91.5 99.1 114.8
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Mineral Data Base Index
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