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magnesiochloritoid

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Journal Article

Thermodynamic properties of magnesiochloritoid Available to Purchase

Klaus-Dieter GREVEL, Wolf-Achim KAHL, Juraj MAJZLAN, Alexandra NAVROTSKY, Christian LATHE, Thomas FOCKENBERG
Published: 01 July 2005
European Journal of Mineralogy (2005) 17 (4): 587–598.
DOI: https://doi.org/10.1127/0935-1221/2005/0017-0587
...Klaus-Dieter GREVEL; Wolf-Achim KAHL; Juraj MAJZLAN; Alexandra NAVROTSKY; Christian LATHE; Thomas FOCKENBERG Abstract Calorimetric and P-V-T data of synthetic magnesiochloritoid (MgAl 2 SiO 5 (OH) 2 ) have been obtained. The P-V-T behaviour of monoclinic and triclinic magnesiochloritoid has been...
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Magnesiochloritoid, and the Fe-Mg series in the chloritoid group Available to Purchase

Christian Chopin, Eberhard Seidel, Thomas Theye, Giovanni Ferraris, Gabriella Ivaldi, Michele Catti
Published: 01 February 1992
European Journal of Mineralogy (1992) 4 (1): 67–76.
View PDF for article title, <span class="search-highlight">Magnesiochloritoid</span>, and the Fe-Mg series in the chloritoid group
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Crystal structure at 25 and 700 degrees C of magnesiochloritoid from a high-pressure assemblage (Monte Rosa) Available to Purchase

Gabriella Ivaldi, Michele Catti, Giovanni Ferraris
Published: 01 April 1988
American Mineralogist (1988) 73 (3-4): 358–364.
...Gabriella Ivaldi; Michele Catti; Giovanni Ferraris Abstract Sets of 2508 and 1556 independent X-ray diffraction data were collected at 25 and 700 °C, respectively, from magnesiochloritoid of a high-pressure assemblage (Monte Rosa, Western Alps). Lattice parameters were measured at several...
View PDF for article title, Crystal structure at 25 and 700 degrees C of <span class="search-highlight">magnesiochloritoid</span> from a high-pressure assemblage (Monte Rosa)
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Pressure-temperature diagram showing magnesiochloritoid reaction (1) as calculated with the Berman (1988) dataset augmented by the data listed in Table 8. Also included are experimental reversals of Chopin (1985) and Fockenberg (unpublished data) - filled symbols indicate growth of magnesiochloritoid; open symbols indicate breakdown of magnesiochloritoid, grey symbol: no reaction. Error bars are ± 10°C in temperature and ± 0.08 GPa in pressure.

Pressure-temperature diagram showing magnesiochloritoid reaction (1) as cal... Available to Purchase

Published: 01 July 2005
Fig. 7. Pressure-temperature diagram showing magnesiochloritoid reaction (1) as calculated with the Berman (1988) dataset augmented by the data listed in Table 8 . Also included are experimental reversals of Chopin (1985) and Fockenberg (unpublished data) - filled symbols indicate growth
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Example of an energy-dispersive X-ray diffraction pattern of magnesiochloritoid sample Cld 2000 obtained at P = 2.2 GPa and T = 200°C (run 94). The diffraction peaks were indexed according to Koch-Müller et al. (2000) in triclinic symmetry. Note that the sample contains a monoclinic portion. Reflections definitely belonging to monoclinic magnesiochloritoid are highlighted.

Example of an energy-dispersive X-ray diffraction pattern of magnesiochlori... Available to Purchase

Published: 01 July 2005
Fig. 2. Example of an energy-dispersive X-ray diffraction pattern of magnesiochloritoid sample Cld 2000 obtained at P = 2.2 GPa and T = 200°C (run 94). The diffraction peaks were indexed according to Koch-Müller et al. (2000) in triclinic symmetry. Note that the sample contains
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BSE image of the synthetic chloritoid sample Cld 2000. A large magnesiochloritoid crystal (rim marked with arrows) of ideal composition (within the error of the measurement) has grown from a small Fe-Mg-intermediate crystal (marked with a cross) representing the composition of the natural seeds used for the first step of the synthesis procedure. The large crystal is surrounded by small crystals, which were too small for microprobe analysis. From our XRD results these crystals must be magnesiochloritoid as well.

BSE image of the synthetic chloritoid sample Cld 2000. A large magnesiochlo... Available to Purchase

Published: 01 July 2005
Fig. 1. BSE image of the synthetic chloritoid sample Cld 2000. A large magnesiochloritoid crystal (rim marked with arrows) of ideal composition (within the error of the measurement) has grown from a small Fe-Mg-intermediate crystal (marked with a cross) representing the composition of the natural
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Unit-cell parameters of triclinic magnesiochloritoid as a function of press... Available to Purchase

Published: 01 July 2005
Table 3. Unit-cell parameters of triclinic magnesiochloritoid as a function of pressure and temperature.
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Estimated thermochemical data and measured volumetric data of magnesiochlor... Available to Purchase

Published: 01 July 2005
Table 4. Estimated thermochemical data and measured volumetric data of magnesiochloritoid from the literature.
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List of reactions involving magnesiochloritoid, which were used for the MAP... Available to Purchase

Published: 01 July 2005
Table 7. List of reactions involving magnesiochloritoid, which were used for the MAP-analysis.
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Unit-cell volume of magnesiochloritoid as a function of pressure and temperature. For the sake of clarity, error bars are omitted.

Unit-cell volume of magnesiochloritoid as a function of pressure and temper... Available to Purchase

Published: 01 July 2005
Fig. 5. Unit-cell volume of magnesiochloritoid as a function of pressure and temperature. For the sake of clarity, error bars are omitted.
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Thermodynamic cycle to calculate the enthalpy of formation of magnesiochlor... Available to Purchase

Published: 01 July 2005
Table 6. Thermodynamic cycle to calculate the enthalpy of formation of magnesiochloritoid. The respective heats of drop solution are listed in Table 3 .
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Lattice parameters of synthetic monoclinic and triclinic magnesiochloritoid... Available to Purchase

Published: 01 July 2005
Table 2. Lattice parameters of synthetic monoclinic and triclinic magnesiochloritoid (Cld 2000) at room temperature and pressure, determined by Rietveld refinement.
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Unit-cell parameters of magnesiochloritoid as a function of pressure; error bars are as given in Table 3; the estimated uncertainty in pressure is ± 0.3 GPa.

Unit-cell parameters of magnesiochloritoid as a function of pressure; error... Available to Purchase

Published: 01 July 2005
Fig. 4. Unit-cell parameters of magnesiochloritoid as a function of pressure; error bars are as given in Table 3 ; the estimated uncertainty in pressure is ± 0.3 GPa.
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Unit-cell volume of magnesiochloritoid as a function of pressure; error bars are as given in Table 3; the estimated uncertainty in pressure is ± 0.3 GPa. Comodi et al. (1992) investigated a monoclinic specimen with XMg = 0.65. For comparison their volume data were divided by 2 and included.

Unit-cell volume of magnesiochloritoid as a function of pressure; error bar... Available to Purchase

Published: 01 July 2005
Fig. 3. Unit-cell volume of magnesiochloritoid as a function of pressure; error bars are as given in Table 3 ; the estimated uncertainty in pressure is ± 0.3 GPa. Comodi et al. (1992) investigated a monoclinic specimen with X Mg = 0.65. For comparison their volume data were divided by 2
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Measured and calculated heat capacity of magnesiochloritoid. The solid curve shows estimated CP-values obtained from the sum of its component oxides (Berman &amp; Brown, 1985) whereas calculated heat capacities using equation (5) (Holland &amp; Powell, 1998) are shown by the dashed curve. The data of Koch-Müller et al. (2002) are depicted by crosses and the polynomial proposed by Patrick &amp; Chopin (1989) is represented by plus symbols.

Measured and calculated heat capacity of magnesiochloritoid. The solid curv... Available to Purchase

Published: 01 July 2005
Fig. 6. Measured and calculated heat capacity of magnesiochloritoid. The solid curve shows estimated C P -values obtained from the sum of its component oxides ( Berman & Brown, 1985 ) whereas calculated heat capacities using equation (5) ( Holland & Powell, 1998 ) are shown
Journal Article

TEM evidence for high-temperature (300 degrees C) smectite in multistage clay-mineral pseudomorphs in pelitic rocks (Rif, Morocco) Available to Purchase

Philippe Agard, Michael Jullien, Bruno Goffe, Alain Baronnet, Mohammed Bouybaouene
Published: 01 August 1999
European Journal of Mineralogy (1999) 11 (4): 655–668.
..., single-crystal X-ray diffraction, and HRTEM reveals a complex metamorphic replacement sequence of a previous high-pressure metamorphic mineral, possibly magnesiochloritoid. Within the pseudomorphs, three zones are recognized based on the occurrence of distinct layer silicates, which crystallized under...
View PDF for article title, TEM evidence for high-temperature (300 degrees C) smectite in multistage clay-mineral pseudomorphs in pelitic rocks (Rif, Morocco)
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Pressure–temperature diagram showing the stability fields of pyrope, magnesiostaurolite, magnesiochloritoid, and Mg-sursassite (see Fockenberg 2008), as well as topaz-(OH) (Wunder et al. 1993). The reaction curves K-feldspar + H2O = K-cymrite (for water activities of 0.1 and 1) and K-cymrite = KAlSi3O8-hollandite + H2O are from Fasshauer et al. (1997) and Yong et al. (2006), respectively. For the stability fields of SiO2 and C polymorphs, see Figure 1.

Pressure–temperature diagram showing the stability fields of pyrope, magnes... Available to Purchase

Published: 01 August 2013
F igure 4 Pressure–temperature diagram showing the stability fields of pyrope, magnesiostaurolite, magnesiochloritoid, and Mg-sursassite (see Fockenberg 2008 ), as well as topaz-(OH) ( Wunder et al. 1993 ). The reaction curves K-feldspar + H 2 O = K-cymrite (for water activities of 0.1 and 1
Journal Article

Synthetic and natural Fe-Mg chloritoid : structural, spectroscopic and thermodynamic studies Available to Purchase

Monika KOCH-MÜLLER, Irmgard ABS-WURMBACH, Klaus LANGER, Cliff SHAW, Richard WIRTH, Matthias GOTTSCHALK
Published: 01 March 2000
European Journal of Mineralogy (2000) 12 (2): 293–314.
DOI: https://doi.org/10.1127/0935-1221/2000/0001-0293
...}\ Mg_{1-x})_{2}Al_{4}O_{2}[SiO_{4}]_{2}(OH)_{4}\) \end{document} ( Chopin et al. , 1992 ). Fe-rich chloritoid is characteristically found in rocks of low grade, whereas magnesiochloritoid is a key-mineral in high-pressure pelitic blueschists ( Chopin, 1983 ). Although a lot of work has been done...
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View PDF for article title, Synthetic and natural Fe-Mg chloritoid : structural, spectroscopic and thermodynamic studies
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High-pressure IR-spectra and the thermodynamic properties of chloritoid Available to Purchase

Monika Koch-Müller, Anne M. Hofmeister, Yingwei Fei, Zhenxian Liu
Published: 01 May 2002
American Mineralogist (2002) 87 (5-6): 609–622.
DOI: https://doi.org/10.2138/am-2002-5-603
... be removed from the starting material by hand picking under a stereomicroscope. To obtain pure samples of Mg-rich chloritoid, we isolated the lighter magnesiochloritoid (ρ ≈ 3.17 g/cm 3 ) from the heavier staurolite (ρ ≈ 3.5 g/cm 3 ) by heavy liquid gravity separation using methyleniodid (ρ = 3.3 g/cm 3 ). X...
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Continental Crust at Mantle Depths: Key Minerals and Microstructures Available to Purchase

Hans-Peter Schertl, Patrick J. O'Brien
Journal: Elements
Published: 01 August 2013
Elements (2013) 9 (4): 261–266.
DOI: https://doi.org/10.2113/gselements.9.4.261
...F igure 4 Pressure–temperature diagram showing the stability fields of pyrope, magnesiostaurolite, magnesiochloritoid, and Mg-sursassite (see Fockenberg 2008 ), as well as topaz-(OH) ( Wunder et al. 1993 ). The reaction curves K-feldspar + H 2 O = K-cymrite (for water activities of 0.1 and 1...
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View PDF for article title, Continental Crust at Mantle Depths: Key Minerals and Microstructures
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