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  • Earth Sciences  (5)
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  • Earth Sciences  (5)
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  • 1
    Online Resource
    Online Resource
    The effect of Fe-for-Si substitution on the b -dimension of nontronite
    Mineralogical Society ; 1978
    In:  Clay Minerals Vol. 13, No. 2 ( 1978-06), p. 133-137
    Details
    In: Clay Minerals, Mineralogical Society, Vol. 13, No. 2 ( 1978-06), p. 133-137
    Abstract: Un estudio de espaciamientos 060 de esmectitas dioctaédricas ha demostrado queen el caso de las nontronitas que sólo tienen hierro en sitios octaédricos existe una relación lineal entre la dimensión axial b y el número de átomos de Fe 3+ coordenados tetraédricamente por cada malla que contiene O 20 (OH) 4 . La pendiente, 0·0497 Å/Fe 3+ , es más pronunciada que la del aumento en b resultante del Fe 3+ en sitios octaédricos, 0·0377 Å/Fe 3+ , lo que demuestra la mayor importancia de la sustitución tetraédrica para influir en b . Los factores que tienen en cuenta el número de átomos Fe 3+ en los sitios tetraédricos se han incorporado en fórmulas existentes para calcular las dimensiones de las mallas en el eje b para las esmectitas, pero generalmente tienen menos éxito en la predicción de b que una fórmula nueva en la que sólo entran en juego los contenidos de hierro tetraédrico y octaédrico.
    Type of Medium: Online Resource
    ISSN: 0009-8558 , 1471-8030
    URL: Article
    DOI: 10.1180/claymin.1978.013.2.01
    RVK:
    TE 1000
    Language: English
    Publisher: Mineralogical Society
    Publication Date: 1978
    detail.hit.zdb_id: 2036186-5
    detail.hit.zdb_id: 961059-5
    SSG: 13
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    A swelling hematite/layer-silicate complex in weathered granite
    Mineralogical Society ; 1981
    In:  Clay Minerals Vol. 16, No. 3 ( 1981-09), p. 261-278
    Details
    In: Clay Minerals, Mineralogical Society, Vol. 16, No. 3 ( 1981-09), p. 261-278
    Abstract: Se ha encontrado en complejo natural óxido de hierro hematítico/silicato laminar, en unas manchas moteadas de rojo de un granito profundamente alterado en el noreste de Escocia. Los diagramas de difracción de R-X muestran un espaciado basal de 36 Å—observable asimismo por microscopia de alta resolución-que se expande hasta 40 Å con glicerol y se contrae a 33·5 Å por calentamiento. Los diagramas de microdifracción electrónica corresponden a una mezcla hematites/silicato laminar con el eje a de la hematities paralelo al eje b del silicato. El espectro I.R. del complejo muestra claramente la contribución de cada uno de los componentes. El silicato, con bandas debidas a la tensión OH a 3602 cm −1 , a la deformación OH a 855 cm −1 y a la tensión Si-O a 1085, 1035, 540 y 471 cm −1 se parece a una pirofilita ferruginosa, mientras que la hematites, con una banda perpendicular al plano a 647 cm −1 , en el piano a 519, 438, 400, 302 y 227 cm −1 y un diagrama characterístico de intensidades relativas, es similar a una forma planar de hematities del suelo. El análisis por microsonda electrónica de las partículas individuales del complejo dan una relación (Fe + Al): Si de 6: 1 que es consistente con una estructura formada por doce capas octahédricas terminadas en ambos lados por una capa de silicato. El complejo parece que se formó a partir de una ferrihidrita silícea que con el tiempo se fue organizando progresivamente.
    Type of Medium: Online Resource
    ISSN: 0009-8558 , 1471-8030
    URL: Article
    DOI: 10.1180/claymin.1981.016.3.04
    RVK:
    TE 1000
    Language: English
    Publisher: Mineralogical Society
    Publication Date: 1981
    detail.hit.zdb_id: 2036186-5
    detail.hit.zdb_id: 961059-5
    SSG: 13
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    New IR and XRD data for leadhillite of ideal composition
    Mineralogical Society ; 1983
    In:  Mineralogical Magazine Vol. 47, No. 344 ( 1983-09), p. 371-375
    Details
    In: Mineralogical Magazine, Mineralogical Society, Vol. 47, No. 344 ( 1983-09), p. 371-375
    Abstract: The infra-red spectrum and X-ray powder pattern of a chemically analysed specimen of leadhillite, a lead carbonate sulphate hydroxide mineral from Leadhills, Scotland, are shown to be different from those in the literature. The IR spectra of several specimens suggest that mutual replacement of SO 4 , CO 3 , and OH may occur in this mineral, and it is thought that this might be responsible for the observed variation in X-ray spacings.
    Type of Medium: Online Resource
    ISSN: 0026-461X , 1471-8022
    URL: Article
    DOI: 10.1180/minmag.1983.047.344.13
    RVK:
    TE 1000
    Language: English
    Publisher: Mineralogical Society
    Publication Date: 1983
    detail.hit.zdb_id: 2034522-7
    SSG: 13
    Location Call Number Limitation Availability
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Macaulayite, a new mineral from North-East Scotland
    Mineralogical Society ; 1984
    In:  Mineralogical Magazine Vol. 48, No. 346 ( 1984-03), p. 127-129
    Details
    In: Mineralogical Magazine, Mineralogical Society, Vol. 48, No. 346 ( 1984-03), p. 127-129
    Abstract: Macaulayite was found by the late I. Stephen (Soil Science Department, University of Aberdeen) in an outcrop of reddened, deeply weathered granite, near Inverurie, Aberdeenshire. It is blood red in colour, very fine-grained, and has refractive indices greater than 1.734. Its calculated density is 4.41 g/cm 3 . The mean of fourteen electron microprobe analyses in the anhydrous form is Fe 2 O 3 84.67, Al 2 O 3 4.01, SiO 2 11.32%. With thermogravimetric data this leads to a formula of ( Al 3.38 )Si 7.95 O 86 (OH) 4 ; the ideal formula is Si 4 O 43 (OH) 2 . The cell indexes as C-centred monoclinic with a 5.038, b 8.726, c 36.342Å, β 92°. The strongest X-ray lines are 36.6 (vs), 18.16 (vs), 3.700 (25), 2.720 (35), 2.533 (100), 2.214 (20), and 1.420 (35). Macaulayite has a layer structure, thought to consist of a double hematite unit terminated on both sides by silicate sheets and with water between these sheets. The infra-red spectrum includes absorption bands at 3597, 1052, 1033, and 858 cm −1 , arising from the hydroxysilicate component of the mineral and at 647, 520, 438, 400, 304, and 227 cm −1 corresponding to the platy hematite unit. The mineral is named for the Macaulay Institute for Soil Research and the name was approved by the Commission on New Minerals and Mineral Names of the International Mineralogical Association prior to publication.
    Type of Medium: Online Resource
    ISSN: 0026-461X , 1471-8022
    URL: Article
    DOI: 10.1180/minmag.1984.048.346.17
    RVK:
    TE 1000
    Language: English
    Publisher: Mineralogical Society
    Publication Date: 1984
    detail.hit.zdb_id: 2034522-7
    SSG: 13
    Location Call Number Limitation Availability
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Cation exchange in synthetic manganates: II. The structure of an alkylammonium-saturated phyllomanganate
    Mineralogical Society ; 1986
    In:  Clay Minerals Vol. 21, No. 5 ( 1986-12), p. 957-964
    Details
    In: Clay Minerals, Mineralogical Society, Vol. 21, No. 5 ( 1986-12), p. 957-964
    Abstract: A synthetic phyllomanganate saturated with a series of primary alkylammonium cations has been examined using XRD, chemical analysis and X-ray photoelectron spectroscopy. A linear relationship exists between the basal spacing of the saturated alkylammonium-manganate and the hydrocarbon chain length in the interlayer, and from the gradient it is concluded that the alkyl chains are perpendicular to the manganate sheet. This orientation is a function of both the charge density and the presence of a layer of water molecules immediately adjacent to the manganate basal surfaces. Evacuation results in the loss of this interlayer water and the structure of the organo-manganate is considerably disrupted. The extent to which the interlayer arrangement can be reinstated by rehydration is dependent on the chain length of the saturating organo-cation. For cations of chain length 〉 C6 the C contents suggest that cation in excess of the exchange capacity is present in the interlayer, but the absence of any compensating anion and the release of amine on evacuation suggests that the excess C arises from the presence of free amine.
    Type of Medium: Online Resource
    ISSN: 0009-8558 , 1471-8030
    URL: Article
    DOI: 10.1180/claymin.1986.021.5.09
    RVK:
    TE 1000
    Language: English
    Publisher: Mineralogical Society
    Publication Date: 1986
    detail.hit.zdb_id: 2036186-5
    detail.hit.zdb_id: 961059-5
    SSG: 13
    Location Call Number Limitation Availability
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    Online Resource
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