Card No: 3888       Created: 28/11/1988    Last edition: 13/01/2009

Name: PYRRHOTITE
Specification: [2], "distorted" structure type - nickeline
Formula: Fe7S8
Symmetry Class: trigonal
Space Group: P 3(1)21
Unit Cell
Parameters:
a = 6.8652 | c = 17.0460
Number of Formula Unit: Z = 3Unit Cell Volume, Å3: Vc = 695.76
Number of Atomic Position
per full Unit Cell
:
P/U = 45 Molar Volume, cm3/mol: Vm = 139.69
Number of Reflexes used in
Structure Determination
:

-
X-ray density, g/cm3: p = 4.63
R-factor: -MU, 1/cm: µ = 397.409
Wave Length for Calculated
Powder Diffraction Patterns
:
Co=1.78892Mass attenuation coefficient,
cm2/g
:
µ/p = 85.761
Theta-Interval for CPDP: T/I = 1-45