Inorganic Solid Phases

Ca2(Mg0.65,Co0.35)(AsO4)2·2H2O (Ca2Mg0.65Co0.35[AsO4]2[H2O]2) Crystal Structure

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General Information

  • Phase Label(s): Ca2Mg0.65Co0.35[AsO4]2[H2O]2
  • Structure Class(es): –
  • Classification by Properties: –
  • Mineral Name(s): talmessite
  • Pearson Symbol: aP15
  • Space Group: 2
  • Phase Prototype: Ca2Mg[PO4]2[H2O]2
  • Measurement Detail(s): automatic diffractometer; 23 (determination of cell parameters), automatic diffractometer; Philips PW1100 (determination of structural parameters), X-rays, Mo Kα; λ = 0.071069 nm (determination of cell and structural parameters)
  • Phase Class(es): –
  • Compound Class(es): arsenate, hydrate
  • Interpretation Detail(s): positions of non-H atoms determined, full-matrix least-squares refinement; 979 reflections; F > 4σ(F), R = 0.081
  • Sample Detail(s): talmessite sample from Morocco, Bou-Azzer district, single crystal (determination of cell parameters), single crystal, 0.10×0.13×0.85 mm3 (determination of structural parameters)

Substance Summary

  • Standard Formula: Ca2Mg0.65Co0.35[AsO4]2[H2O]2
  • Alphabetic Formula: [AsO4]2Ca2Co0.35[H2O]2Mg0.65
  • Published Formula: Ca2(Mg0.65,Co0.35)(AsO4)2·2H2O
  • Refined Formula: As2Ca2Co0.35H4Mg0.65O10
  • Wyckoff Sequence: 2,i7d
  • Z Formula Units: 1
  • Density: ρ = 3.63 Mg·m−3
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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

Anisotropic

Site
B11 [nm2]
B22 [nm2]
B33 [nm2]
B12 [nm2]
B13 [nm2]
B23 [nm2]

Experimental Details

Reference

3D Interactive Structure

About this content

  • Database name

    PAULING FILE Multinaries Edition – 2012

  • Dataset ID

    sd_1920415

  • 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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