Material name Olivine (Forsterite)
Composition (Mg0.9Fe0.1)2SiO4
Chemical formula weight 147.00
System Orthorhombic
Temperature (ºC) r.t.
a (Å), b (Å), c (Å) 4.762 10.225 5.994 @
α (deg), β (deg), γ (deg) 90 90 90 @
Unit cell volume (Å3) 291.9
Calculated density (g/p3) 3.34
Z 4
Space group Pbnm (No.62)
atom site g x/a y/b z/c B2)
Mg1 4a 0.9 0 0 0 0.33(3)
Fe1 4a 0.1 0 0 0 0.33(3)
Mg2 4c 0.9 0.98975(29) 0.27743(16) 1/4 0.36(3)
Fe2 4c 0.1 0.98975(29) 0.27743(16) 1/4 0.36(3)
Si 4c 1 0.42693(27) 0.09434(13) 1/4 0.20(3)
O1 4c 1 0.76580(72) 0.09186(36) 1/4 0.35(5)
O2 4c 1 0.22012(72) 0.44779(36) 1/4 0.42(5)
O3 8d 1 0.27810(50) 0.16346(25) 0.03431(46) 0.41(5)

Reference: J.D. Birle, G.V. Gibbs, P.B. Moore, and J.V. Smith, American Mineralogist, 53, 807 (1968).