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tobelite

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Journal Article
Published: 01 February 2016
Mineralogical Magazine (2016) 80 (1): 143–156.
...G. C. Capitani; E. Schingaro; M. Lacalamita; E. Mesto; F. Scordari Abstract A transmission electron microscopy (TEM) investigation was undertaken in order to elucidate the nature of the structural disorder in a tobelite specimen from the sedimentary rocks of the Armorican sandstones (western France...
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Journal Article
Published: 01 December 2013
The Canadian Mineralogist (2013) 51 (6): 945–946.
FIGURES
Journal Article
Published: 01 October 2013
The Canadian Mineralogist (2013) 51 (5): 689–704.
... with decreasing NH 4 contents (tobelite, NH 4 -bearing white mica, and K-micas), probably through three successive processes: deuteric alteration, prograde reactions, and retrogressive reactions. The presence of N in cordierite is interpreted to be due to the transfer of the NH 4 , initially contained in biotite...
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Journal Article
Published: 01 October 2013
American Mineralogist (2013) 98 (10): 1848–1859.
...,OD) 2 , where x = 0.0–3.0, y = 0.0–3.0, and the muscovite–tobelite series, (d) [K 1–A (NH 4 ,ND 4 ) A ]Al 3 Si 3 O 10 (OH,OD) 2 , where A = 0.0–1.0, indicate that there is a complete solid-solution in each series. In the 200–50 cm −1 far-infrared region, four kinds of bands are observed: two bands...
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Journal Article
Published: 01 August 2012
American Mineralogist (2012) 97 (8-9): 1460–1468.
...Ernesto Mesto; Fernando Scordari; Maria Lacalamita; Emanuela Schingaro Abstract The crystal structures of tobelite and NH 4 + -rich muscovite from the sedimentary rocks of the Armorican sandstones (Brittany, France) have been solved for the first time by single-crystal X-ray diffraction...
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Journal Article
Published: 01 August 2010
Clays and Clay Minerals (2010) 58 (4): 558–572.
..., in addition, tobelite, which comprises some of the detrital grains and strongly masks the illite crystallinity values. Tobelite has been identified only in the upper thrust slices, suggesting that changes in the detrital input is primarily responsible for the disappearance of tobelite at the transition from...
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Journal Article
Published: 01 January 2007
American Mineralogist (2007) 92 (1): 151–165.
...-feldspar–buddingtonite, muscovite–tobelite series, and quartz. The run products were characterized by electron microprobe, powder X-ray diffraction with Rietveld analysis, and infrared spectroscopy. It can be shown that complete solid solution exists for both series for temperatures at least above 400 °C...
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Journal Article
Published: 01 January 2004
American Mineralogist (2004) 89 (1): 85–93.
...Guy L. Hovis; Daniel Harlov; Matthias Gottschalk Abstract Enthalpies of solution of the NH 4 + -bearing minerals buddingtonite (NH 4 AlSi 3 O 8 feldspar) and tobelite [NH 4 Al 2 (AlSi 3 O 10 ) (OH) 2 mica] have been measured in 20.1 wt% hydrofluoric acid (HF) at 50°C. Utilizing additional HF...
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Journal Article
Published: 01 November 2002
American Mineralogist (2002) 87 (11-12): 1686–1691.
...Mainak Mookherjee; Simon A.T. Redfern; Ming Zhang; Daniel E. Harlov Abstract Orientational order-disorder behavior of NH 4 + is a well-established phenomenon in certain ammonium halides and ammonium salts. Anticipating similar behavior of ammonium in the interlayer site of tobelite, synthetic ND 4...
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Journal Article
Published: 01 February 2002
Clays and Clay Minerals (2002) 50 (1): 82–98.
... simultaneously with the diagenetic transformation of I-S. We demonstrate a link between the two reactions: NH 3 released from kerogen during maximum oil generation is fixed as NH 4 + in the NH 4 -bearing mica or tobelite layers formed from smectite or vermiculite layers in I-S, in a diagenetic interval which we...
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Journal Article
Published: 01 August 1992
Clays and Clay Minerals (1992) 40 (4): 405–420.
Image
<span class="search-highlight">Tobelite</span> (Tob) crystal in the core of the quartz (Qz) vein from the SADC76 ...
Published: 05 March 2019
Fig. 4 Tobelite (Tob) crystal in the core of the quartz (Qz) vein from the SADC76 sample (A. in plane-polarized light and B. between crossed polars). Tobelite crystals with Chlorite (Chl) along the vein border from the SADC76 sample (C. in plane-polarized light and D. between crossed polars). E
Image
A. Typical Pb-Sb-Au vein of the stage 3 from SADC. Wall rocks (to the left)...
Published: 05 March 2019
Fig. 3 A. Typical Pb-Sb-Au vein of the stage 3 from SADC. Wall rocks (to the left) are rich in sphalerite (Sp) and galena (Gn) whereas vein centre (to the right) shows sulfosalts (here boulangerite, Blg) and tobelite (Tob) enclosed within a quartz gangue. B. Polished thin section microphotograph
Image
High-frequency zone of the Raman spectra obtained from the porphyroblasts s...
Published: 01 October 2013
Fig. 7 High-frequency zone of the Raman spectra obtained from the porphyroblasts shown in Figures 4A and D , from mica from the matrix and from synthetic tobelite. See text for explanation. Tob: Tobelite.
Image
A. Single grain  40 Ar&#x2F; 39 Ar dating of <span class="search-highlight">tobelite</span> (from SADC76 sample) from ...
Published: 05 March 2019
Fig. 5 A. Single grain 40 Ar/ 39 Ar dating of tobelite (from SADC76 sample) from vein of the hydrothermal stage 3 (Pb-Sb-Au). The age error bars for each temperature steps and plateau age are given at the 1 σ level. B. Inverse isochron analysis of the SADC76 α tobelite experiment.
Image
XRD patterns (oriented mounts) of three selected samples, showing the 001 (...
Published: 01 October 2013
Fig. 6 XRD patterns (oriented mounts) of three selected samples, showing the 001 (A) and 005 (B) reflections of micas. Modeling corresponding to 6% Tob + 94% Ms is included in each case at the bottom. (C) FTIR spectra of the same samples and of synthetic tobelite. See text for explanation. Tob
Journal Article
Published: 01 June 2007
Clays and Clay Minerals (2007) 55 (3): 260–283.
... minerals include for each sample two mixed-layer phases consisting of pyrophyllite, margarite, paragonite, tobelite, illite, smectite and vermiculite layers. The main, 80 m thick intrusion resulted in the formation of pyrophyllite, margarite, paragonite and tobelite layers. However, the tobelite layers...
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Journal Article
Published: 01 September 2000
American Mineralogist (2000) 85 (9): 1223–1238.
..., one of which contains 0.05 and the other 0.25 smectite (S) interlayers. The first phase does not change during metamorphism. In the second phase, 0.20 S are converted to tobelite (T) layers through fixation of \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage...
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Image
Relationship between proportion of <span class="search-highlight">tobelite</span> layers,  w  T , formation tempe...
Published: 01 February 2002
Figure 12. Relationship between proportion of tobelite layers, w T , formation temperature of the samples, T , and vitrinite reflectance values, R o , for North Sea and Norwegian–Danish basin I-T-S-V minerals. Labels for each point correspond to the w T value for the I-T-S-V
Image
<span class="search-highlight">Tobelite</span>&#x2F;muscovite area including mixed-layers in sample Ge-7. Two- and thr...
Published: 01 February 2002
F igure 8. Tobelite/muscovite area including mixed-layers in sample Ge-7. Two- and three-layer periodicities are pointed out in the image. SAED pattern (inset) shows an intermediate (00 l ) spot between the first and the second one. Similar intermediate spots between higher-order reflections