Inorganic Solid Phases

CaAl2Si2O7(OH)2·H2O (CaAl2[Si2O7][OH]2[H2O] hp, p = 11.9 GPa) Crystal Structure

General Information

  • Phase Label(s): CaAl2[Si2O7][OH]2[H2O] hp
  • Structure Class(es):
  • Classification by Properties:
  • Mineral Name(s): lawsonite hp
  • Pearson Symbol: mP30
  • Space Group: 11
  • Phase Prototype: CaAl2[Si2O7][OH]2[H2O]
  • Measurement Detail(s): automatic diffractometer (determination of cell parameters), automatic diffractometer; United Kingdom, Cheshire, Daresbury Synchrotron Radiation Source (determination of structural parameters), X-rays, synchrotron; λ = 0.04654 nm (determination of cell and structural parameters), p = 11.9 GPa (determination of cell and structural parameters)
  • Phase Class(es):
  • Compound Class(es): hydroxide, disilicate, hydrate
  • Interpretation Detail(s): positions of non-H atoms determined; pressure dependence studied, Rietveld refinement
  • Sample Detail(s): lawsonite sample from U.S.A. California, Jenner, electron microprobe analysis; composition confirmed; small amounts of Fe and Mg detected, powder (determination of cell and structural parameters)

Substance Summary

  • Standard Formula: CaAl2[Si2O7][OH]2[H2O]
  • Alphabetic Formula: Al2Ca[H2O][OH]2[Si2O7]
  • Published Formula: CaAl2Si2O7(OH)2·H2O
  • Refined Formula: Al2CaH4O10Si2
  • Wyckoff Sequence: 11,f5e3da
  • Z Formula Units: 2
  • Density: ρ = 3.33 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

Experimental Details

Reference

3D Interactive Structure

About this content

  • Database name

    PAULING FILE Multinaries Edition – 2012

  • Dataset ID

    sd_1813192

  • 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)

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