Inorganic Solid Phases

(Mg,Na2)Al3(F-OH)11·2H2O; Na3Al13Mg3F31(OH)17(H2O)7 (Na0.35Mg0.35Al1.65[OH]2.1F3.9[H2O]0.88) Crystal Structure

General Information

  • Phase Label(s): Na0.35Mg0.35Al1.65[OH]2.1F3.9[H2O]0.88
  • Structure Class(es): pyrochlore family
  • Classification by Properties:
  • Mineral Name(s): ralstonite
  • Pearson Symbol: cF88
  • Space Group: 227
  • Phase Prototype: (Na0.5Ca0.5)2Nb2O6F
  • Measurement Detail(s): film (determination of cell and structural parameters), X-rays, Mo (determination of cell and structural parameters)
  • Phase Class(es):
  • Compound Class(es): hydroxide, fluoride, hydrate
  • Interpretation Detail(s): positions of non-H atoms determined, trial-and-error
  • Sample Detail(s): ralstonite sample from Greenland, Ivittuut, chemical analysis; Na4.27Mg4.39Al24.25F39.91[OH]19.46[H2O]8.43 in wt.%, powder (determination of cell and structural parameters)

Substance Summary

  • Standard Formula: Na0.35Mg0.35Al1.65[OH]2.1F3.9[H2O]0.88
  • Alphabetic Formula: Al1.65F3.9[H2O]0.88Mg0.35Na0.35[OH]2.1
  • Published Formula: (Mg,Na2)Al3(F-OH)11·2H2O; Na3Al13Mg3F31(OH)17(H2O)7
  • Refined Formula: Al1.66F3.90H3.85Mg0.34Na0.35O2.98
  • Wyckoff Sequence: 227,fdca
  • Z Formula Units: 8
  • Density: ρ = 2.58 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

Powder Pattern

published defraction line
sin2(θ) [1]
computed diffraction line for Cu Kα
d [nm]
intensity
I [1]
h [1]
k [1]
l [1]
Radiation
Remark

Experimental Details

Reference

3D Interactive Structure

About this content

  • Database name

    PAULING FILE Multinaries Edition – 2012

  • Dataset ID

    sd_1213207

  • 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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