The structure of Mn-rich tuperssuatsiaite

A palygorskite-related mineral

Fernando Cámara, Laurence Garvie, B. Devouard Bertrand, Thomas L. Groy, P R Buseck

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The structure of tuperssuatsiaite from the Aris phonolite in central Namibia was refined to an R index of 0.075 for 905 observed reflections [I > 2σ(I)] obtained with a four-circle X-ray diffractometer. Tuperssuatsiaite is monoclinic, C2/m, with a = 14.034(7), b = 17.841(7), c = 5.265(2) Å, and β = 103.67(4)°. Microprobe analysis gave an average composition of Na1.87Fe2.14Mn0.48 palygorskite Mg5[Si8O20](OH)2-H2O. Tuperssuatsiaite consists of ribbons of SiO4 tetrahedra linked by bands of octahedra running parallel to c. Channels occur that could be occupied by H2O as in palygorskite. The octahedral band contains three edge-sharing, six-coordinated sites labeled M1, M2, and M3. This band consists of alternating M3-M1-M3 and M2-M2 octahedra along [001]. The M1 and M2 sites both contain Fe and Mn, and M3 is occupied by Na. Bondvalence calculations indicate a formal charge of 2.48 for M1 and 2.67 for M2, i.e., a charge distribution of 2R3+:1R2+. Octahedral angle variance and volume are similar for both sites, indicating disorder in the distribution of Fe and Mn atoms between the sites. Charge balance requirements agree with the presence of Fe3+ and Mn2+.

Original languageEnglish (US)
Pages (from-to)1458-1463
Number of pages6
JournalAmerican Mineralogist
Volume87
Issue number10
StatePublished - Oct 2002

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palygorskite
Minerals
minerals
phonolite
Charge distribution
Diffractometers
mineral
Namibia
diffractometers
X rays
tetrahedrons
Atoms
charge distribution
ribbons
Chemical analysis
disorders
requirements
atoms
attapulgite
distribution

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

The structure of Mn-rich tuperssuatsiaite : A palygorskite-related mineral. / Cámara, Fernando; Garvie, Laurence; Devouard Bertrand, B.; Groy, Thomas L.; Buseck, P R.

In: American Mineralogist, Vol. 87, No. 10, 10.2002, p. 1458-1463.

Research output: Contribution to journalArticle

Cámara, F, Garvie, L, Devouard Bertrand, B, Groy, TL & Buseck, PR 2002, 'The structure of Mn-rich tuperssuatsiaite: A palygorskite-related mineral', American Mineralogist, vol. 87, no. 10, pp. 1458-1463.
Cámara, Fernando ; Garvie, Laurence ; Devouard Bertrand, B. ; Groy, Thomas L. ; Buseck, P R. / The structure of Mn-rich tuperssuatsiaite : A palygorskite-related mineral. In: American Mineralogist. 2002 ; Vol. 87, No. 10. pp. 1458-1463.
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