Cambridge University Press (CUP)
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Influence of Al Substitution and Crystal Size on the Room-Temperature Mössbauer Spectrum of Hematite
Cambridge University Press (CUP) - Tập 34 - Trang 1-6 - 1986
Mössbauer spectra of 15 hematites with Al substitutions between 0 and 10 mole %
were taken at room temperature. X-ray powder diffraction indicated dimensions of
these hematites in the c-direction to range upwards from 27 nm to crystals large
enough to show no line broadening. The Mössbauer spectra showed that magnetic
hyperfine fields decreased both with increasing Al-for-Fe substitution and with
...
Diagenetic reorientation of phyllosilicate minerals in Paleogene mudstones of the Podhale Basin, southern Poland
Cambridge University Press (CUP) - Tập 56 - Trang 100-111 - 2008
We used high-resolution X-ray texture goniometry to quantify changes in the
mm-scale orientation of phyllosilicate minerals in a suite of Paleogene
mudstones from the Podhale Basin in southern Poland. The sample set covers an
estimated range of burial depths between 2.4 and 7.0 km, corresponding to a
temperature range of 60–160°C. Although mechanical compaction has reduced
porosities to ∼10% in th...
Erratum to: An Experimentally Derived Kinetic Model for Smectite-to-Illite Conversion and its Use as a Geothermometer
Cambridge University Press (CUP) - Tập 41 - Trang 770-770 - 1993
“An Experimentally Derived Kinetic Model for Smectite-to-Illite Conversion and
its Use as a Geothermometer,” written by Wuu-Liang Huang, John M. Longo, and
David R. Pevear and appearing in Clays & Clay Minerals 41, pp. 162–177, contains
a typographical error.
Electron Microscopy as a Method of Identifying Clays
Cambridge University Press (CUP) - Tập 1 - Trang 130-150 - 1952
Electron microscope studies show that most of the clay minerals have
morphological characteristics which can be effectively used to aid in their
identification. In addition, detailed studies at high magnification have
provided structural information not obtainable by other means. In the kaolinite
group each of the common minerals has a clear-cut and diagnostic morphology.
However, much more work i...
Artificial Alteration of Biotite into a 14 Å Layer Silicate with Hydroxy-Aluminium Interlayers
Cambridge University Press (CUP) - Tập 22 Số 3 - Trang 241-252 - 1974
Lithium-Bearing Donbassite and Tosudite from Echassières, Massif Central, France
Cambridge University Press (CUP) - - 1988
AbstractLithium-bearing donbassite and tosudite were found in veins in
hydrothermally altered granite (Beauvoir granite) in the northern part of the
Massif Central, France. The two minerals are characterized by their high Li
contents and low Mg and Fe contents; their structural formulae are: $${\left(
{S{i_{3.81}}A{l_{0.19}}} \right)_{\Sigma = 4.00}}{O_{10}}{\left(
{A{l_{3.81}}L{i_{0.52}}Fe_{0.01}...
Thermal Reactions of Synthetic Hectorite
Cambridge University Press (CUP) - Tập 18 - Trang 339-346 - 1970
The thermal reaction sequence of a synthetic hectorite (Laponite CP) was studied
by X-ray diffraction, i.r. spectroscopy and thermal analysis. Although most of
the interlayer water is removed at 200°C, a smally steady weight loss occurs
until dehydroxylation is complete at about 700°C, indicating that an anhydrous
intermediate phase is not formed prior to dehydroxylation. Immediately after
dehydro...
The Effect of Dissolved Ligands on the Sorption of Cu(II) by Ca-Montmorillonite
Cambridge University Press (CUP) - Tập 42 - Trang 148-160 - 1994
The effects of three organic ligands on the adsorption of copper on
Ca-montmorillonite were studied. The results indicate that these effects include
three different processes: Ethylenediamine promotes copper uptake by
ion-exchange at low pH but tends to suppress adsorption at aluminol groups by
ligand competition at high pH. The same mechanisms are operative for β-alanine;
however, the uptake of C...
NaOH Dissolution of Some Oxide Impurities from Kaolins
Cambridge University Press (CUP) - Tập 12 - Trang 633-647 - 1963
A working definition for allophane includes amorphous silica and alumina that
are quickly soluble in boiling n/2 NaOH. Kinetic studies are used to
differentiate and to make a rough estimation of the amount of allophane and
certain other impurities present in some kaolin minerals. Solution rate studies
on opal, gibbsite, two allophanes, volcanic ash, quartz, two halloysites, and
two kaolinites are ...
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