Card No: 57       Created: 12/10/1997    Last edition: 13/01/2009

Name: AKERMANITE
Specification: [5], structure type - melilite, at 0.80 GPa
Formula: Ca2MgSi2O7
Symmetry Class: tetragonal
Space Group: P 4(-)2(1)m
Unit Cell
Parameters:
a = 7.8154 | c = 4.9919
Number of Formula Unit: Z = 2Unit Cell Volume, Å3: Vc = 304.91
Number of Atomic Position
per full Unit Cell
:
P/U = 24 Molar Volume, cm3/mol: Vm = 91.83
Number of Reflexes used in
Structure Determination
:

NR = 618
X-ray density, g/cm3: p = 2.97
R-factor: R = 0.0340MU, 1/cm: µ = 202.701
Wave Length for Calculated
Powder Diffraction Patterns
:
Cu=1.54056Mass attenuation coefficient,
cm2/g
:
µ/p = 68.283
Theta-Interval for CPDP: T/I = 1-45