The crystal structure of sarkinite, Mn2AsO4(OH)

  • A. Dal Negro
  • G. Giuseppetti
  • J. M. Martin Pozas


Sarkinite is a basic manganese arsenate, Mn2AsO4(OH). The lattice parameters are:a=12.779 (2) Å,b=13.596 (2) Å,c=10.208 (2) Å, β=108°53′ (6′). Space groupP21/a,Z=16. The crystal structure has been solved by direct methods from three-dimensional X-ray diffractometer data and refined by least-squares methods toR=0.052 for 3519 independent reflections. The crystal structure is built up by a three-dimensional framework of MnO4(OH)2 octahedra, MnO4(OH) trigonal bipyramids and AsO4 tetrahedra, as found in wagnerite. Isotypy of sarkinite with triploidite is confirmed.


Reflection Crystal Structure Manganese Arsenate Geochemistry 
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Die Kristallstruktur des Sarkinits, Mn2AsO4(OH)


Die Kristallstruktur des basischen Manganarsenates Sarkinit, Mn2AsO4(OH), mit den Gitterkonstantena=12,779 (2) Å,b=13,596 (2) Å,c=10,208 (2) Å, β=108°53′ (6′). RaumgruppeP21/a,Z=16, wurde mit dreidimensionalen Röntgendiffraktometermessungen durch direkte Methoden gelöst und nach dem kleinste-Quadrate-Verfahren verfeinert (R=0,052 für 3519 unabhängige Reflexe). Die Struktur besteht aus einem dreidimensionalen Gerüst aus MnO4(OH)2-Oktaedern, trigonalen Bipyramiden von MnO4(OH) und AsO4-Tetraedern wie in Wagnerit. Die Isotypie von Sarkinit mit Triploidit wurde bestätigt.


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Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • A. Dal Negro
    • 1
  • G. Giuseppetti
    • 1
  • J. M. Martin Pozas
    • 2
  1. 1.Centro di Cristallografia Strutturale del C.N.R.-Istituto di Mineralogia dell'Università di PaviaPaviaItaly
  2. 2.Instituto “Lucas Mallada” (S. Mineralogia)MadridSpain

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