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The structure of Mn-rich tuperssuatsiaite: A palygorskite-related mineral
-
Fernando Cámara
,
Bertrand Devouard
Veröffentlicht/Copyright:
28. März 2015
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 Ti0.14Al0.03Mg0.02[Si8O20](OH)2·n(H2O), with five octahedral sites. The structure is closely related to that of 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+.
Received: 2001-3-13
Accepted: 2002-6-19
Published Online: 2015-3-28
Published in Print: 2002-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- Atomic-scale observations of franckeite surface morphology
- Surface control vs. diffusion control during calcite dissolution: Dependence of step-edge velocity upon solution pH
- First-principles calculation of the infrared spectrum of lizardite
- Hard-mode infrared spectroscopy of perovskites across the CaTiO3-SrTiO3 solid solution
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- Electron paramagnetic resonance spectroscopic study of synthetic fluorapatite: Part III. Structural characterization of sub-ppm-level Gd and Mn in minerals at W-band frequency
- Experimental determination of the equilibria: rutile + magnesite = geikielite + CO2 and zircon + 2 magnesite = baddeleyite + forsterite + 2 CO2
- Symplectites derived from metastable phases in martian basaltic meteorites
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