Card No: 29       Created: 26/10/2001    Last edition: 15/01/2015

Name: AENIGMATITE
Specification: [3], structure type - aenigmatite, syn, at 13 Gpa
Formula: Na2Mg4Fe2Si6O20
Symmetry Class: triclinic
Space Group: P 1(-)
Unit Cell
Parameters:
a = 10.3280 | b = 10.7240 | c = 8.8050 | alpha = 105.1500 | beta = 96.8500 | gamma = 125.4700
Number of Formula Unit: Z = 2Unit Cell Volume, Å3: Vc = 719.67
Number of Atomic Position
per full Unit Cell
:
P/U = 68 Molar Volume, cm3/mol: Vm = 216.74
Number of Reflexes used in
Structure Determination
:

-
X-ray density, g/cm3: p = 3.33
R-factor: -MU, 1/cm: µ = 159.739
Wave Length for Calculated
Powder Diffraction Patterns
:
Co=1.78892Mass attenuation coefficient,
cm2/g
:
µ/p = 47.911
Theta-Interval for CPDP: T/I = 1-45