Card No: 3996       Created: 07/05/2001    Last edition: 29/07/2016

Name: ROLLANDITE
Specification: [1], structure type - hopeite
Formula: Cu3[AsO4]2 · 4H2O
Symmetry Class: orthorhombic
Space Group: P nma
Unit Cell
Parameters:
a = 5.6906 | b = 17.0610 | c = 9.7320
Number of Formula Unit: Z = 4Unit Cell Volume, Å3: Vc = 944.85
Number of Atomic Position
per full Unit Cell
:
P/U = 68 Molar Volume, cm3/mol: Vm = 142.28
Number of Reflexes used in
Structure Determination
:

NR = 1407
X-ray density, g/cm3: p = 3.80
R-factor: R = 0.0860MU, 1/cm: µ = 174.862
Wave Length for Calculated
Powder Diffraction Patterns
:
Cu=1.54056Mass attenuation coefficient,
cm2/g
:
µ/p = 46.033
Theta-Interval for CPDP: T/I = 1-45