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The crystal structure of mammothite, Pb6Cu4AlSbO2(OH)16Cl4(SO4)2

  • H. Effenberger
Article

Summary

The crystal structure of mammothite, Pb6Cu4AlSbO2(OH)16Cl4(SO4)2, was determined by single crystal X-ray investigations (a=18.93(3) Å,b=7.33(1) Å,c=11.35(2) Å, β=112.44(10)°, space groupC2/m, Z=2). The refinement yieldedR w =0.047 for 2465 reflections with sinθ/λ⩽0.80Å-1. Mammothite is one of the few minerals with the Sb atom in the pentavalent state. The crystal structure contains [AlO(h)6] and [SbO2O(h)4] octahedra as well as zigzag chains built up by [Cu(1)[4]O(h)4] and [Cu(2)[4+1]OO(h)4] polyhedra. The coordination of the two crystallographically different Pb atoms may be described as [Pb(1)O(h)4ClO(s)4] and [Pb(2)OO(h)3Cl2O(s)3]. The connection of the coordination polyhedra results in a three-demensional network structure.

Keywords

Reflection Crystal Structure Geochemistry Network Structure Coordination Polyhedron 
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 Mammothit, Pb6Cu4AlSbO2(OH)16Cl4(SO4)2

Zusammenfassung

Die Kristallstruktur von Mammothit, Pb6Cu4AlSbO2(OH)16Cl4(SO4)2, wurde mittels röntgenographischer Einkristalluntersuchungen bestimmt (a=18,93(3) Å,b=7,33(1) Å,c=11,35(2) Å, β=112,44(10)°, RaumgruppeC2/m, Z=2). Die Strukturverfeinerung ergab für 2465 Reflexe mit sinθ/λ⩽0,80Å-1R w =0,047. Mammothit ist eines der wenigen Minerale mit fünfwertigen Sb-Atomen. Die Kristallstruktur besteht aus [AlO(h)6]- und [SbO2O(h)4]-Oktaedern sowie aus zu zickzackförmigen Ketten verknüpften [Cu(1)[4]O(h)4] und [Cu(2)[4+1]OO(h)4]-Polyedern. Die Koordinationen der beiden kristallographisch verschiedenen Pb-Atome können als [Pb(1)O(h)4ClO(s)4] und [Pb(2)OO(h)3Cl2O(s)3] beschrieben werden. Durch die Verknüpfung der Koordinationspolyeder entsteht ein dreidimensionaler Gerüstverband.

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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • H. Effenberger
    • 1
  1. 1.Institut für Mineralogie und Kristallographie der Universität WienWienAustria

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