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Refinement of an Amesite-2H1 Polytype from Postmasburg, South Africa

Published online by Cambridge University Press:  28 February 2024

Hong Zheng  and
Sturges W. Bailey
Hong Zheng*
Affiliation:
Department of Geology and Geophysics, 1215 West Dayton Street, University of Wisconsin-Madison, Madison, Wisconsin 53706
Sturges W. Bailey
Affiliation:
Department of Geology and Geophysics, 1215 West Dayton Street, University of Wisconsin-Madison, Madison, Wisconsin 53706
*
†Present address: 8109 West 96th Street, Bloomington, Minnesota 55438.
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Abstract

The crystal structure of amesite-2H1 from the Postmasburg Mn ores of South Africa has been refined to R = 4.7% using Siemens P4 rotating-anode MoKα X-ray data and SHELXL-93 software. Partial ordering of tetrahedral Si,Al and especially of octahedral Mg,Al has reduced the ideal P63cm symmetry to triclinic P1 (refined as C1). Tetrahedral rotation of 15° moves the basal oxygens toward the octahedral cations in the same layer but away from the OH H-donors of the next layers. The ordering pattern of AlIV and AlVI is unique in that the locus of Al-rich sites consists of 2 intersecting sets of zigzag lines parallel to X2 and X3, plus 2 Al-rich octahedra in layer 2 instead of the usual 1 site.

Keywords

Amesite-2H1DistortionsOrdering PatternsPostmasburgRefinementSouth AfricaTwinning
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 3 , June 1997 , pp. 301 - 310
Copyright
Copyright © 1997, The Clay Minerals Society

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Footnotes

‡

Deceased November 30, 1994.

References

Anderson, C.S. and Bailey, S.W., (1981) A new cation-ordering pattern in amesite-2H 2 Am Mineral 66 66–195.Google Scholar
Bailey, S.W., (1969) Polytypism of trioctahedral 1:1 layer silicates Clays Clay Miner 17 355–371 10.1346/CCMN.1969.0170605.CrossRefGoogle Scholar
Bailey, S.W. and Bailey, S.W., (1988) Structures and compositions of other trioctahedral 1:1 phyllosilicates: Chapter 6 Hydrous phyllosilicates (exclusive of micas). Rev Mineral 19 Ann Arbor, MI Mineral Soc Am. 169–188 10.1515/9781501508998-011.CrossRefGoogle Scholar
Bailey, S.W. Banfield, J.F. and Barker, W.W., (1995) Dozite, a 1:1 regular interstratification of serpentine/chlorite Am Mineral 80 65–77 10.2138/am-1995-1-207.CrossRefGoogle Scholar
Busing, W.R., Martin, K.O. and Levy, H.A.. 1964. OR FEE, a Fortran crystallographic function and error program. Oak Ridge National Laboratory Technical Manual 306. 85 p.Google Scholar
de Villiers, J.E., (1946) Some minerals occurring in South African manganese deposits Trans Geol Soc S Africa 48 48 25.Google Scholar
Giese, R.R.F. Jr., (1980) Hydroxyl orientations and interlayer bonding in amesite Clays Clay Miner 28 81–86 10.1346/CCMN.1980.0280201.CrossRefGoogle Scholar
Hall, S.H. and Bailey, S.W., (1976) Amesite from Antarctica Am Mineral 61 61–499.Google Scholar
Hall, S.H. and Bailey, S.W., (1979) Cation ordering pattern in amesite Clays Clay Miner 27 27–247 10.1346/CCMN.1979.0270401.CrossRefGoogle Scholar
Nelson, D.O. and Guggenheim, S., (1993) Inferred limitations to the oxidation of Fe in cholorite: A high-temperature single-crystal X-ray study Am Mineral 78 78–1207.Google Scholar
Peacor, D.R. Essene, E.J. Simmons, W.B. Jr and Bigelow, W.C., (1974) Kellyite, a new Mn-Al member of the serpentine group from Balb Knob, North Carolina Am Mineral 39 957–975.Google Scholar
Shannon, R.D., (1976) Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides Acta Crystallogr A32 751–767 10.1107/S0567739476001551.CrossRefGoogle Scholar
Steadman, R. and Nuttall, P.M., (1962) The crystal structure of amesite Acta Crystallogr 15 15–511 10.1107/S0365110X62001267.CrossRefGoogle Scholar
Steinfink, H. and Brunton, G., (1956) The crystal structure of amesite Acta Crystallogr 9 9–492 10.1107/S0365110X56001339.CrossRefGoogle Scholar
Taner, M.F. and Laurent, R., (1984) Iron-rich amesite from the Lake Asbestos mine, Black Lake, Quebec Can Mineral 22 437–442.Google Scholar
Wiewióra, A. Rusell-Colom, J.A. and García-González, T., (1991) The crystal structure of amesite from Mount Sobotka: A nonstandard polytype Am Mineral 76 76–652.Google Scholar