Card No: 1096       Created: 24/04/1990    Last edition: 13/01/2009

Name: CUMMINGTONITE
Specification: [2]
Formula: Ca0.24Mn2.41Mg4.2Fe0.15Si8O22(OH)2
Symmetry Class: monoclinic-beta
Space Group: C 2/m
Unit Cell
Parameters:
a = 9.6050 | b = 18.1240 | c = 5.3250 | beta = 102.6400
Number of Formula Unit: Z = 2Unit Cell Volume, Å3: Vc = 904.52
Number of Atomic Position
per full Unit Cell
:
P/U = 82 Molar Volume, cm3/mol: Vm = 272.41
Number of Reflexes used in
Structure Determination
:

NR = 1212
X-ray density, g/cm3: p = 3.13
R-factor: R = 0.0470MU, 1/cm: µ = 134.576
Wave Length for Calculated
Powder Diffraction Patterns
:
Co=1.78892Mass attenuation coefficient,
cm2/g
:
µ/p = 42.963
Theta-Interval for CPDP: T/I = 1-45