Abstract
The stacking order of a 14.30-Å Mg-vermiculite from Santa-Olalla, Spain, has been determined from Weissenberg photographs. The results prove that the Mg-vermiculite structure is not a 2-layer polytype structure, but a semi-ordered one. Because the structure is semi-ordered, its resolution needed a dual approach: (1) a direct approach using an electron density projection along the y axis in conjunction with a one-dimensional electron-density projection onto the z axis; and (2) an indirect approach in which the observed intensities along the (0,k) and (1,k) reciprocal rods were compared to the calculated intensities given by model defect structures. The semi-ordered structure of the Mg-vermiculite results from ±b/3 shifts in the stacking of the silicate layers. The shifts are randomly either along +b or -b.
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Adams, J. M. and Riekel, C. (1980) One-dimensional neutron diffraction study of a vermiculite: Clays & Clay Minerals 28, 444–445.
Alcover, J. F. and Gatineau, L. (1980) Structure de l’espace interlamellaire de la vermiculite-Mg bicouche: Clay Miner. 15, 25–36.
Bailey, S. W. (1986) Re-evaluation of ordering and local charge-balance in Ia-chlorite: Can. Mineral. 24, 649–654.
Ben Rhaïem, H., Tessier, D., and Pons, C. H. (1986) Comportement hydrique et évolution structurale et texturale des montmorillonites au cours d’un cycle de desiccation-hu-mectation I. Cas des montmorillonites calciques: Clay Miner. 21, 9–29.
Bradley, W. F. and Serratosa, J. M. (1960) A discussion of the water content of vermiculite: in Clays and Clay Minerals Proc. 7th Natl. Conf., Washington, D.C., 1958, Ada Swineford, ed., Pergamon Press, New York, 260–270.
Brindley, G. W. and Robinson, K. (1946) Randomness in structures of kaolinitic clay minerals: Trans. Faraday Soc. 42B, 198–205.
Brindley G. W. and Robinson, K. (1947) X-ray study of some kaolinitic fireclay: Trans. Br. Ceram. Soc. 46, 49–62.
Brown, B. E. and Bailey, S. W. (1962) Chlorite polytypism. I-regular and semi-random one-layer structures: Amer. Mineral 47, 819–840.
de la Calle, C. (1977) Structure des vermiculites. Facteurs conditionnant les mouvements des feuillets: Thèse de Doctorat d’Etat, Université Paris VI, Paris, 133 pp.
de la Calle, C., Dubernat, J., Suquet, H., and Pézerat, H. (1980) Ordre et désordre dans l’empilement des feuillets de phyllosilicates 2:1 hydratés: Bull. Miner. 103, 419–428.
de la Calle, C., Glaeser, R., and Pézerat, H. (1978a) Effect of texture on vermiculite structure: Lithium minerals: in Proc. Int. Clay Conf., Oxford, 1979, M. M. Mortland and V. C. Farmer, eds., Elsevier, Amsterdam, 37–44.
de la Calle, C., Pézerat, H., and Gasperin, M. (1977) Problèmes d’ordre-désordre dans les vermiculites. Structure du minéral calcique à deux couches: J. Phys. C7 38, 128–133.
de la Calle, C., Plançon, A., Pons, C. H., Dubernat, J., Suquet, H., and Pézerat, H. (1984) Mode d’empilement des feuillets dans la vermiculite sodique hydratée à une couche (phase à 11.85 Å): Clay Miner. 19, 563–578.
de la Calle, C., Suquet, H., Dubernat, J., and Pézerat, H. (1978b) Mode d’empilement des feuillets dans les vermiculites hydratées à deux couches: Clay Miner. 13, 275–297.
de la Calle, C., Suquet, H., Dubernat, J., Pézerat, H., Gaultier, J. P., and Mamy, J. (1975a) Crystal structure of two-layer Mg-vermiculites and Na-, Ca-vermiculites: in Proc. Int. Clay Conf., Mexico City, 1975, S. W. Bailey, ed., Applied Publishing, Wilmette, Illinois, 201–209.
de la Calle, C., Suquet, H., and Pézerat, H. (1975b) Glissement de feuillets accompagnant certains échanges de cations dans les vermiculites: Bull. Gr. Franç. Argiles 27, 31–49.
de la Calle, C., Suquet, H., and Pézerat, H. (1985) Vermiculites hydratées à une couche: Clay Miner. 20, 221–230.
Casquet, C. and Velasco, F. (1978) Contributión a la geo-logía de los skarns-cálcicos en torno a Santa Olalla: Estudios Geol. 34, 399–405.
Fornes, V., de la Calle, C., Suquet, H., and Pézerat, H. (1980) Etude de la couche interfoliaire des hydrates à deux couches des vermiculites calciques et magnésiennes: Clay Miner. 15, 399–411.
Gonzalez García, F. and García Ramos, G. (1960) On the genesis and transformations of vermiculite: in Trans. 7th Int. Congress of Soil Science, Madison, Wisconsin, 1960, ed., International Society of Soil Science, 4, 482–491.
Hendricks, S. B. and Teller, E. (1942) X-ray interference in partially ordered layer lattices: J. Chem. Phys. 10, 147–167.
Herrero, C. P., Sanz, J., and Serratosa, J. M. (1985a) Tet-rahedral cation ordering in layer silicates by 29Si NMR spectroscopy: Solid State Comm. 53, 151–154.
Herrero, C. P., Sanz, J., and Serratosa, J. M. (1985b) Si,Al distribution in micas: Analysis by high-resolution 29Si NMR spectroscopy: J. Phys. C: Solid State Phys. 18, 13–32.
Kakinoki, J. and Komura, Y. (1952) Intensity of X-ray diffraction by one-dimensionally disordered crystal: J. Phys. Soc. Japan 7, 30–35.
Maire, J. and Méring, J. (1970) Graphitization of soft carbons: Chem. Phys. Carbon 6, 125–134.
Mathieson, A.M. and Walker, G. F. (1954) Crystal structure of magnesium-vermiculite: Amer. Mineral. 39, 231–255.
Mathieson, A. M. (1958) Mg-vermiculite: A refinement of the crystal structure of the 14.36-Å phase: Amer. Mineral, 43, 216–227.
Méring, J. (1949) Interférence des rayons X dans les systèmes à stratification désordonnée: Acta Crystallogr. 2, 371–377.
Plançon, A. (1981) Diffraction by layer structures containing different kinds of layers and stacking faults: J. Appl. Crystallogr. 14, 300–304.
Puga, E. and Fontbote, J. M. (1979) Génèse des inclusions silicatées des marbres à brucite en enclave dans le batholite de Santa Olalla: C.R. Acad. Sci. Paris 288, 1071–1073.
Slade, P. G. and Stone, P. A. (1984) Three-dimensional order and the structure of aniline-vermiculite: Clays & Clay Minerals 32, 223–226.
Slade, P. G., Stone, P. A., and Radoslovich, E. W. (1985) Interlayer structure of the two layer hydrates of Na- and Ca-vermiculites: Clays & Clay Minerals 33, 51–61.
Shirozu, H. and Bailey, S. W. (1966) Crystal structure of a two-layer Mg-vermiculite: Amer. Mineral. 51, 1124–1143.
Suquet, H. and Pézerat, H. (1987) Parameters influencing layer stacking types in saponites and vermiculites. Clays & Clay Minerals 35, 353–362.
Velasco, F. (1977) Formation de bandas calco-silicatadas en marmoles de la Garrenchosa (Santa Olalla, Huelva): Estudios Geol. 33, 505–515.
Velasco, F., Casquet, C., Ortega Huertas, M., and Rodriguez Gordillo, J. (1981) Indicio de vermiculita en el skarn magnésico (aposkarn flogopitico) de la Garrenchosa (Santa Olalla, Huelva): Soc. Esp. Mineralogia 2, 135–149.
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de la Calle, C., Suquet, H. & Pons, CH. Stacking Order in a 14.30-Å Mg-Vermiculite. Clays Clay Miner. 36, 481–490 (1988). https://doi.org/10.1346/CCMN.1988.0360601
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DOI: https://doi.org/10.1346/CCMN.1988.0360601