Card No: 1282       Created: 08/07/1993    Last edition: 31/05/2018

Name: DUFRENOYSITE
Specification: [1]
Formula: Pb8As8S20
Symmetry Class: monoclinic-beta
Space Group: P 2(1)
Unit Cell
Parameters:
a = 7.9000 | b = 25.7400 | c = 8.3700 | beta = 90.3500
Number of Formula Unit: Z = 2Unit Cell Volume, Å3: Vc = 1701.97
Number of Atomic Position
per full Unit Cell
:
P/U = 72 Molar Volume, cm3/mol: Vm = 512.58
Number of Reflexes used in
Structure Determination
:

NR = 2966
X-ray density, g/cm3: p = 5.65
R-factor: R = 0.0910MU, 1/cm: µ = 959.112
Wave Length for Calculated
Powder Diffraction Patterns
:
Cu=1.54056Mass attenuation coefficient,
cm2/g
:
µ/p = 169.652
Theta-Interval for CPDP: T/I = 1-45