Card No: 2245       Created: 28/10/1997    Last edition: 16/08/2017

Name: JOHNWALKITE
Specification: [1]
Formula: K2(Mn,Fe)4(Nb,Ta)2O4[PO4]4 · 4H2O
Symmetry Class: orthorhombic
Space Group: P b2(1)m
Unit Cell
Parameters:
a = 7.5160 | b = 10.0230 | c = 6.5020
Number of Formula Unit: Z = 1Unit Cell Volume, Å3: Vc = 489.81
Number of Atomic Position
per full Unit Cell
:
P/U = 36 Molar Volume, cm3/mol: Vm = 295.03
Number of Reflexes used in
Structure Determination
:

-
X-ray density, g/cm3: p = 3.57
R-factor: -MU, 1/cm: µ = 338.255
Wave Length for Calculated
Powder Diffraction Patterns
:
Co=1.78892Mass attenuation coefficient,
cm2/g
:
µ/p = 94.807
Theta-Interval for CPDP: T/I = 1-45