Card No: 12229       Created: 13/12/24    Last edition: 27/03/2026

Name: SEDERHOLMITE
Specification: [5], structure type - nickeline, syn
Formula: Ni(Se,S)
Symmetry Class: hexagonal
Space Group: P 6(3)/mmc
Unit Cell
Parameters:
a = 3.5550 | c = 5.3610
Number of Formula Unit: Z = 2Unit Cell Volume, Å3: Vc = 58.68
Number of Atomic Position
per full Unit Cell
:
P/U = 4 Molar Volume, cm3/mol: Vm = 17.67
Number of Reflexes used in
Structure Determination
:

-
X-ray density, g/cm3: p = 6.46
R-factor: -MU, 1/cm: µ = 670.256
Wave Length for Calculated
Powder Diffraction Patterns
:
Co=1.78892Mass attenuation coefficient,
cm2/g
:
µ/p = 103.718
Theta-Interval for CPDP: T/I = 1-45