Card No: 2169       Created: 25/02/2002    Last edition: 13/01/2009

Name: ILVAITE
Specification: [23], "distorted" structure type - ilvaite, at 400oC
Formula: CaFe2+2Fe3+Si2O7O(OH)
Symmetry Class: monoclinic-beta
Space Group: P 2(1)/a
Unit Cell
Parameters:
a = 13.0150 | b = 8.8030 | c = 5.8420 | beta = 90.1600
Number of Formula Unit: Z = 4Unit Cell Volume, Å3: Vc = 669.32
Number of Atomic Position
per full Unit Cell
:
P/U = 64 Molar Volume, cm3/mol: Vm = 100.79
Number of Reflexes used in
Structure Determination
:

-
X-ray density, g/cm3: p = 4.00
R-factor: -MU, 1/cm: µ = 258.721
Wave Length for Calculated
Powder Diffraction Patterns
:
Co=1.78892Mass attenuation coefficient,
cm2/g
:
µ/p = 64.742
Theta-Interval for CPDP: T/I = 1-45