The crystal structure of ruizite, a sorosilicate with an [Si4Ø13] cluster

  • F. C. Hawthorne
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Summary

The crystal structure of ruizite, Ca2Mn2[Si4O11(OH)2](OH)2(H2O)2,a=11.984(3),b=6.175(2),c=9.052(2) Å, β=91.34(2)°,V=669.1 Å3,Z=2, space groupA2, has been solved by direct methods and refined by a full-matrix least-squares method to anR index of 5.6% for 1226 observed (3σ) reflections. Ruizite is a sorosilicate with an [Si4O11(OH)2] linear cluster of corner-sharing tetrahedra; this is the first purely silicate cluster of this type to be found in minerals, but it resembles the [AsSi3O12(OH)] cluster recently found in tiragalloite (Gramaccioli et al., 1979). Edge sharing chains of MnØ6 octahedra extend ‖ [010], and are linked by corner-sharing with tetrahedra to form sheets atx∼0, with the sorosilicate clusters linking adjacent walls along [100]. The structure is best described as a heteropolyhedral framework of Mn octahedra and Si tetrahedra, with Ca occupying the [7] — coordinate interstices between the octahedral-tetrahedral sheets. A brief disussion of “extended cluster” sorosilicates is given.

Keywords

Reflection Crystal Structure Silicate Geochemistry Edge Sharing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Die Kristallstruktur von Ruizit, einem Sorosilikat mit einer [Si4Ø13] Gruppe

Zusammenfassung

Die Kristallstruktur des Ruizits, Ca2Mn2[Si4O11(OH)2](OH)2(H2O)2,a=11,974(3),b=6,175(2),c=9,052(2) Å, β=91,34(2)°,V=669,1 Å3,Z=2, RaumgruppeA2, wurde mit direkten Methoden bestimmt und für 1226 beobachtete (3σ) Reflexe nach der Methode der kleinsten Quadrate mit voller Matrix auf einenR-Index 5,6% verfeinert. Ruizit ist ein Sorosilikat mit einer linearen [Si4O11(OH)2]-Gruppe aus eckenverknüpften Tetraedern; das ist die erste reine Silikatgruppe dieser Art, welche in Mineralen gefunden wurde, aber sie ähnelt der kürzlich im Tiragalloit gefundenen [AsSi3O12(OH)]-Gruppe (Gramaccioli et al., 1979). Kantenverknüpfte Ketten aus MnØ6-Oktaedem verlaufen parallel [010]; diese sind mit Tetraedern so über Ecken verknüpft, daß Schichten umx∼0 entstehen, wobei Sorosilikatgruppen benachbarte Schichten weiter in Richtung [100] verbinden. Die Struktur läßt sich am ehesten als heteropolyedrisches Gerüst aus “Mn-Oktaedern” und “Si-Tetraedern” beschreiben, in dem Ca 7-koordinierte Hohlräume zwischen den Oktaeder-Tetraeder-Schichten besetzt sind. Es wird eine kurze Diskussion von Sorosilikaten mit “gestreckten Gruppen” gebracht.

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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • F. C. Hawthorne
    • 1
  1. 1.Department of Earth SciencesUniversity of ManitobaWinnipegCanada

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