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isomorphic forms

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Journal Article
Published: 01 October 2011
Clays and Clay Minerals (2011) 59 (5): 501-506.
... properties of kaolinite were investigated using an efficient, first-principles scheme for studying isomorphic substitution of Al ions in kaolinite by two kinds of other elements (namely, the dual defect). Elements that are relatively common in natural kaolinite were chosen from groups II (Be, Mg, Ca, and Sr...
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Journal Article
Published: 01 June 2018
Mineralogical Magazine (2018) 82 (3): 649-674.
... gold typical for epithermal deposits. Pyrite included in quartzites and quartz-alunite rocks was probably formed during an early stage of the ore-forming process. During the following Au-rich stage, the $f_{{\rm S}{\rm e}_{\rm 2}}$ / $f_{{\rm S}_{\rm 2}}$ increased with $f_{{\rm O}_{\rm 2}}$ being...
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Six different <b>isomorphic</b> substitutions considered for the {010} edge faces ...
Published: 01 August 2017
Figure 10. Six different isomorphic substitutions considered for the {010} edge faces for layer charge y = 0.50. The octahedral sheets are shown at the top to indicate the isomorphic substitutions. The bottom left figure compares the minimum surface energies of these edge faces. The bottom
Journal Article
Journal: GSA Bulletin
Published: 01 April 1947
GSA Bulletin (1947) 58 (4): 299-392.
... analyses. Both the isometric and “orthorhombic” groups exhibit limited isomorphism in regard to the three metals, and the two groups appear to be essentially complementary. The isometric members form a single group of triarsenides with the skutterudite structure. The long-held assumption that published...
Series: Geological Society, London, Special Publications
Published: 01 January 2004
DOI: 10.1144/GSL.SP.2004.236.01.04
EISBN: 9781862394841
... Abstract This review describes nuclear waste forms for high-level waste (HLW), that is, glasses, ceramics, and glass-ceramics, as well as for low- and intermediate-level waste (LILW), that is, cement, bitumen, glass, glassy slags, and ceramics. Ceramic waste forms have the highest chemical...
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Journal Article
Published: 01 October 2014
Mineralogical Magazine (2014) 78 (5): 1071-1095.
...G. R. Lumpkin; Yan Gao; R. Gieré; C. T. Williams; A. N. Mariano; T. Geisler Abstract Materials designed for nuclear waste disposal include a range of ceramics, glass ceramics and glass waste forms. Those with crystalline phases have provided the momentum for studies of minerals as a means...
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Journal Article
Published: 01 August 2009
Clays and Clay Minerals (2009) 57 (4): 405-415.
... of isomorphous octahedral cations in a smectite 2:1 layer favor the formation of tv and cv structure, respectively, which, in turn, may be due to different physicochemical conditions of formation; HSI may have been formed under more stable physicochemical conditions than those for the SAz-1...
FIGURES
Journal Article
Published: 01 February 1928
American Mineralogist (1928) 13 (2): 52-56.
...A. N. Winchell Abstract There seem to be numerous examples of a simple isomorphous relationship between MgSiO 3 and AIAIO 3 in silicates. Even in the simple molecule, MgSiO 3 , the molecule AlAlO 3 may apparently enter isomorphously to a limited extent, such as, about 5 percent in enstatite and 10...
Series: Special Publications of the Society of Economic Geologists
Published: 01 January 1955
DOI: 10.5382/AV50.13
EISBN: 9781934969526
... its tendency to concentrate in late stage differentiates. In the granitic rocks, uranium occurs mainly as a minor constituent of accessory minerals that have cations (such as rare earths, thorium, and calcium) for which uranium can substitute isomorphously, but it also occurs as an acid-soluble...
Journal Article
Published: 01 August 2016
American Mineralogist (2016) 101 (8): 1735-1749.
... species can form substitutional solid solutions or as they are sometimes called mixed crystals (from the German Mischkristalle ). In fact, the terms isomorphism and (substitutional) solid solution were used interchangeably for many years and among mineralogists the latter is used today. 6 The phenomenon...
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Journal Article
Published: 01 November 2002
American Mineralogist (2002) 87 (11-12): 1590-1606.
... the two-dimensional distributions of the isomorphous octahedral cations using IR and Mössbauer parameters revealed a tendency for Fe segregation into edge-shared octahedra that may form zigzag chains. Almost identical IR and Mössbauer parameters found for the I-S having different amounts of trans...
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Journal Article
Published: 01 April 1977
American Mineralogist (1977) 62 (3-4): 229-245.
... and octacalcium phosphate. R = 0.084 for 2571 independent reflections. Samuelsonite, apatite, and octacalcium phosphate contain regions in their structures which are isomorphic to each other. Beyond these regions, structural isomorphism ceases to exist. The underlying unit is a column of composition [Ca 4 (PO 4...
Journal Article
Published: 01 February 1945
American Mineralogist (1945) 30 (1-2): 1-26.
... of the sample. The impurities may be in the form of admixtures, intergrowths or adsorbed. Silica is likely to be the most abundant impurity of the fine grained minerals. It may occur as crystalline or amorphous forms, or as adsorbed silicate ions. Phosphate, Al, Fe or H ions may also be adsorbed. Brucite...
Journal Article
Published: 01 February 2014
Clays and Clay Minerals (2014) 62 (1): 20-34.
... compositions. Previous studies have found that Fe in natural allophane is a combination of isomorphically substituted Fe and some other form, typically described as a poorly crystalline ferrihydrite ( Ossaka et al. , 1971 ; McBride et al. , 1984 ). In the present study, Fe K-edge XANES peak positions...
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Journal Article
Published: 01 February 1962
American Mineralogist (1962) 47 (1-2): 127-136.
... of corresponding composition. Both heat-treated and untreated synthetics form isomorphous series that conform to Vegard's law. Plots of unit cell dimensions vs. composition for nineteen natural alunite samples outline a flat, reverse S-shaped curve for the alunite-natroalunite isomorphous series which deviates...
Journal Article
Published: 01 December 1955
American Mineralogist (1955) 40 (11-12): 1132-1135.
... -ray studies on an unusual mangan-muscovite (Eskola, 1914) which exhibits very little isomorphous deviation from the theoretical muscovite composition but has crystallized as the 1-layer monoclinic (1M) polymorph rather than the common or “normal” 2M form. Copyright © 1955 by the Mineralogical...
Journal Article
Published: 01 June 1921
American Mineralogist (1921) 6 (6): 100-103.
...Edw. F. Holden Abstract Schaller, in his study of the rutile group, 1 has shown that the iron-rutiles, known as “nigrine” and “iserite,” 2 are isomorphous mixtures of two tetragonal end members, titanyl titanate, TiOTiO 3 , or rutile; and ferrous titanate, FeTiO 3 , which is unknown as a mineral...
Journal Article
Published: 01 March 1932
American Mineralogist (1932) 17 (3): 85-93.
... that crystals of corresponding salts of these acids resembled each other very closely in habit and angles and, not having at that time the means of accurate measurement, he believed that they were identical. In 1821 he introduced the term “isomorphism” in mineralogy, with the following explanation: “An equal...
Journal Article
Journal: Clay Minerals
Published: 01 June 2012
Clay Minerals (2012) 47 (2): 231-242.
.... Nitrogen adsorption-desorption curves showed the creation of new micro porous regions, possibly in the octahedral sheets. In contrast to mineral acid treatment, p-TSA treated clay samples showed similar CEC which shows the absence of dissolution of isomorphously substituted Mg and Fe ions present...
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Journal Article
Published: 01 December 2008
The Canadian Mineralogist (2008) 46 (6): 1389-1400.
... appropriés. Parce que les plagioclases ont une structure triclinique, le comportement de la modulation, par définition, implique seulement le groupe de translation du cristal, qui serait isomorphe du groupe diédrique D n , et, dans le cas d’une relation ordre–désordre, du groupe connexe D 2n . Les deux...
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