Card No: 1581       Created: 09/07/1998    Last edition: 13/01/2009

Name: FORSTERITE
Specification: [21], structure type - olivine, at 22.0 GPa
Formula: Mg2SiO4
Symmetry Class: orthorhombic
Space Group: P bnm
Unit Cell
Parameters:
a = 4.5610 | b = 9.4520 | c = 5.5920
Number of Formula Unit: Z = 4Unit Cell Volume, Å3: Vc = 241.07
Number of Atomic Position
per full Unit Cell
:
P/U = 28 Molar Volume, cm3/mol: Vm = 36.30
Number of Reflexes used in
Structure Determination
:

-
X-ray density, g/cm3: p = 3.88
R-factor: -MU, 1/cm: µ = 118.831
Wave Length for Calculated
Powder Diffraction Patterns
:
Cu=1.54056Mass attenuation coefficient,
cm2/g
:
µ/p = 30.665
Theta-Interval for CPDP: T/I = 1-45