Card No: 1307       Created: 02/12/1988    Last edition: 13/01/2009

Name: ECKERMANNITE
Specification: [2], In, F-analogue, DF
Formula: NaNa2Mg4InSi8O22F2
Symmetry Class: monoclinic-beta
Space Group: C 2/m
Unit Cell
Parameters:
a = 9.8527 | b = 18.0966 | c = 5.2928 | beta = 103.5210
Number of Formula Unit: Z = 2Unit Cell Volume, Å3: Vc = 917.55
Number of Atomic Position
per full Unit Cell
:
P/U = 82 Molar Volume, cm3/mol: Vm = 276.34
Number of Reflexes used in
Structure Determination
:

-
X-ray density, g/cm3: p = 3.23
R-factor: -MU, 1/cm: µ = 184.923
Wave Length for Calculated
Powder Diffraction Patterns
:
Cu=1.54056Mass attenuation coefficient,
cm2/g
:
µ/p = 57.256
Theta-Interval for CPDP: T/I = 1-45