Inorganic Solid Phases

K0.8(Ca1.2Na0.8)Mg5Si8O22(OH)2 (KNaCaMg5Si8O22[OH]2) Crystal Structure

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General Information

  • Phase Label(s): KNaCaMg5Si8O22[OH]2
  • Structure Class(es): –
  • Classification by Properties: –
  • Mineral Name(s): richterite
  • Pearson Symbol: mS80
  • Space Group: 12
  • Phase Prototype: NaCa2Mg2(Mg0.67Sc0.33)3(Al0.25Si0.75)8O22[OH]2
  • Measurement Detail(s): automatic diffractometer (determination of cell parameters), automatic diffractometer; Philips PW1710 (determination of structural parameters), X-rays (determination of cell and structural parameters)
  • Phase Class(es): –
  • Compound Class(es): hydroxide, silicate
  • Interpretation Detail(s): positions of non-H atoms determined; composition dependence studied, Rietveld refinement, multiphase; 55 variables, RP = 0.0763; wRP = 0.1037; RB = 0.0541
  • Sample Detail(s): richterite sample from synthetic, electron microprobe analysis; 57.47 wt.% SiO2, 24.07 wt.% MgO, 7.53 wt.% CaO, 3.09 wt.% Na2O, 4.46 wt.% K2O, powder (determination of cell and structural parameters)

Substance Summary

  • Standard Formula: K0.8Na0.8Ca1.2Mg5Si8O22[OH]2
  • Alphabetic Formula: Ca1.2K0.8Mg5Na0.8O22[OH]2Si8
  • Published Formula: K0.8(Ca1.2Na0.8)Mg5Si8O22(OH)2
  • Refined Formula: Ca1.18H2K0.82Mg5Na0.82O24Si8
  • Wyckoff Sequence: 12,j7i3h2ga
  • Z Formula Units: 2
  • Density: ρ = 3.00 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

Experimental Details

Reference

3D Interactive Structure

About this content

  • Database name

    PAULING FILE Multinaries Edition – 2012

  • Dataset ID

    sd_1213223

  • 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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