Card No: 3287       Created: 26/11/1997    Last edition: 13/01/2009

Name: FORSTERITE
Specification: [63], structure type - olivine, analogue
Formula: Na2BeF4
Symmetry Class: orthorhombic
Space Group: P bnm
Unit Cell
Parameters:
a = 4.8900 | b = 10.9000 | c = 6.5600
Number of Formula Unit: Z = 4Unit Cell Volume, Å3: Vc = 349.65
Number of Atomic Position
per full Unit Cell
:
P/U = 28 Molar Volume, cm3/mol: Vm = 52.65
Number of Reflexes used in
Structure Determination
:

NR = 370
X-ray density, g/cm3: p = 2.49
R-factor: R = 0.0600MU, 1/cm: µ = 50.206
Wave Length for Calculated
Powder Diffraction Patterns
:
Cu=1.54056Mass attenuation coefficient,
cm2/g
:
µ/p = 20.184
Theta-Interval for CPDP: T/I = 1-45