Inorganic Solid Phases

(K0.72,Na0.28)Al3(SO4)2(OH)6 (K0.5Na0.5Al3[SO4]2[OH]6) Crystal Structure

General Information

  • Phase Label(s): K0.5Na0.5Al3[SO4]2[OH]6
  • Structure Class(es):
  • Classification by Properties:
  • Mineral Name(s): alunite/natroalunite
  • Pearson Symbol: hR60
  • Space Group: 166
  • Phase Prototype: KAl3[SO4]2[OH]6
  • Measurement Detail(s): automatic diffractometer (determination of cell parameters), automatic diffractometer; PANalytical X'Pert MPD (determination of structural parameters), X-rays, Cu Kα (determination of cell and structural parameters)
  • Phase Class(es):
  • Compound Class(es): hydroxide, sulfate
  • Interpretation Detail(s): positions of non-H atoms determined, Rietveld refinement; 30 variables, RP = 0.16; wRP = 0.16; RB = 0.07
  • Sample Detail(s): alunite sample from Tunisia, Kairouan district, El Gnater, atomic absorption spectroscopy; K/Na ratio 2.846/1, powder (determination of cell and structural parameters)

Substance Summary

  • Standard Formula: K0.72Na0.28Al3[SO4]2[OH]6
  • Alphabetic Formula: Al3K0.72Na0.28[OH]6[SO4]2
  • Published Formula: (K0.72,Na0.28)Al3(SO4)2(OH)6
  • Refined Formula: Al3H6K0.72Na0.28O14S2
  • Wyckoff Sequence: 166,h2ec2b
  • Z Formula Units: 3
  • Density: ρ = 2.83 Mg·m−3

Crystallographic Data

Cell Parameters

Published Data
Standardized Data
Unit Cell
Niggli-Reduced Cell
Space Group
a
b
c
α
β
γ
a/b
b/c
c/a
V

Atom Coordinates

Standardized

Site
Element
Wyckoff Symbol
Symmetry
X
Y
Z
Occupation
Co-ord. No.
Atomic Env.

Published

Site
Element
Wyckoff Symbol
Symmetry
X
Y
Z
Occupation

Displacement Parameters

Isotropic

Site
Published
B [nm2]
Type
Computed
Beq [nm2]

Experimental Details

Reference

3D Interactive Structure

About this content

  • Database name

    PAULING FILE Multinaries Edition – 2012

  • Dataset ID

    sd_1124452

  • Copyright

    ©Springer & Material Phases Data System (MPDS), Switzerland & National Institute for Materials Science (NIMS), Japan, 2016

  • Chief Editor

    Pierre Villars, Material Phases Data System (MPDS), CH-6354 Vitznau, Switzerland

    villars.mpds@bluewin.ch

  • Credits

    SpringerMaterials Release 2016.

    Data generated pre-2002: © Springer & MPDS & NIMS; post-2001: © Springer & MPDS

    All Rights Reserved. Version 2016.10.

    Project Coordinator: Shuichi Iwata

    Section-Editor: Karin Cenzual (Crystal Structures)

  • Cite this content

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