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oxy-dravite

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Journal Article
Published: 01 August 2013
American Mineralogist (2013) 98 (8-9): 1557-1564.
...-chromium-dravite and oxy-dravite by the homovalent substitution Cr 3+ ↔ Al 3+ . Tourmaline chemical compositions classified as chromo-alumino-povondraite can be either Cr-dominant or Al-dominant as a result of the compositional boundaries along the solid solution between Cr and Al that are determined at Y...
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Journal Article
Published: 01 March 2004
European Journal of Mineralogy (2004) 16 (2): 323-333.
...Milan NOVÁK; Pavel POVONDRA; Julie B. SELWAY Abstract Wet-chemical analyses (41) of tourmaline from granitic pegmatites (barren, barren-pocket, beryl, lepidolite types) in the Moldanubicum, Czech Republic revealed that members of the oxy-subgroup - common oxy-schorl , minor oxy-dravite and rare...
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Journal Article
Published: 01 June 2017
European Journal of Mineralogy (2017) 29 (3): 445-455.
...Ferdinando Bosi; Fernando Cámara; Marco E. Ciriotti; Ulf Hålenius; Leonid Reznitskii; Vincenzo Stagno Abstract: Two oxy-tourmalines showing intermediate compositions between the oxy-schorl and oxy-dravite series (sample from Sludyanka crystalline complex, Baikal, Russia) and the oxy-dravite...
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Journal Article
Published: 28 February 2018
Mineralogical Magazine (2018) 82 (4): 913-928.
...Adam Pieczka; Andreas Ertl; Mateusz P. Sęk; Diana Twardak; Sylwia Zelek; Eligiusz Szełęg; Gerald Giester ABSTRACT Yellowish dravitic tourmaline (dominated by the oxy-dravite component) associated with secondary fluor-dravite/fluor-schorl and dravite/schorl tourmalines was found in a quartz vein...
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Journal Article
Published: 01 June 2014
Mineralogical Magazine (2014) 78 (3): 681-692.
...G. D. Gatta; F. Bosi; G. J. Mcintyre; H. Skogby Abstract A single-crystal neutron diffraction study of oxy-dravite from Osarara (Narok district, Kenya) was performed. Intensity data were collected in Laue geometry at 10 K and anisotropic-structure refinement was undertaken. For the first time, two...
FIGURES
Journal Article
Published: 01 January 2014
American Mineralogist (2014) 99 (1): 218-224.
...Ferdinando Bosi; Henrik Skogby; Leonid Reznitskii; Ulf Hålenius Abstract Vanadio-oxy-dravite, NaV 3 (Al 4 Mg 2 )(Si 6 O 18 )(BO 3 ) 3 (OH) 3 O, is a new mineral of the tourmaline supergroup. It is found in metaquartzites of the Pereval marble quarry (Sludyanka, Lake Baikal, Russia) in association...
FIGURES
Journal Article
Published: 01 August 2013
American Mineralogist (2013) 98 (8-9): 1442-1448.
...Ferdinando Bosi; Henrik Skogby Abstract Oxy-dravite, Na(Al 2 Mg)(Al 5 Mg)(Si 6 O 18 )(BO 3 ) 3 (OH) 3 O, is a new mineral of the tourmaline supergroup. The holotype specimen originates from the locality of Osarara (Narok district, Kenya) and occurs in quartz-muscovite schist. Crystals of oxy...
FIGURES
Journal Article
Published: 01 February 2013
American Mineralogist (2013) 98 (2-3): 501-505.
...Ferdinando Bosi; Leonid Z. Reznitskii; Eugene V. Sklyarov Abstract “Vanadium-dravite” NaMg 3 V 6 (Si 6 O 18 )(BO 3 ) 3 (OH) 3 OH (IMA number 1999-050) has been redefined as oxy-vanadium-dravite with end-member formula NaV 3 (V 4 Mg 2 )Si 6 O 18 (BO 3 ) 3 (OH) 3 O. The new name and the new formula...
FIGURES
Journal Article
Published: 01 May 2016
The Canadian Mineralogist (2016) 54 (3): 661-679.
... basement rocks along the P2 fault: early oxy-schörl [(Na 0.47 □ 0.37 Ca 0.16 )(Fe 2+ 1.30 Al 0.91 Mg 0.72 Ti 0.07 )Al 6 (Si 5.79 Al 0.21 O 18 )(BO 3 ) 3 OH 3 (O 0.63 OH 0.29 F 0.08 ), where □ = vacancy] of metamorphic-anatectic origin, hydrothermal oxy-dravite [(Na 0.57 Ca 0.23 □ 0.18 K 0.02 )(Mg 1.93 Fe 2...
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Journal Article
Published: 01 May 2010
American Mineralogist (2010) 95 (5-6): 799-809.
...-talc altered rocks contain discrete grains and clusters of tourmaline crystals, which may be associated with emerald and/or chromian muscovite. Tourmalines from the Mingora and Gujar Kili emerald mines and the Spin Obo-Kuh area are Ni-bearing, Cr-rich dravites and “oxy-dravites” that exhibit...
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Crystallographical data and refinement details for <b>oxy</b>-<b>dravite</b> from Wołowa ...
Published: 28 February 2018
Table 3. Crystallographical data and refinement details for oxy-dravite from Wołowa Góra Mountain. X-ray radiation Mo K α (λ = 0.71073 Å) Z 3 Space group R 3 m (no. 160) a , c (Å) 15.916(1), 7.180(1) V (Å 3 ) 1575.2(3) Crystal dimensions (mm) 0.10 × 0.12
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Atom parameters in <b>oxy</b>-<b>dravite</b> from Wołowa Góra Mountain.         Site   x ...
Published: 28 February 2018
Table 4. Atom parameters in oxy-dravite from Wołowa Góra Mountain. Site x y z U eq Occupancy X 0 0 0.2337(2) 0.0193(3) Na 0.744(7) Ca 0.120 Y 0.12461(3) ½× 0.63230(7) 0.0062(1) Mg 0.949(3) Fe 0.051(3) Z 0.29786(2) 0.26151(2) 0.61170(5
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Selected interatomic distances in <b>oxy</b>-<b>dravite</b> from Wołowa Góra Mountain.   ...
Published: 28 February 2018
Table 5. Selected interatomic distances in oxy-dravite from Wołowa Góra Mountain. X–O2 ×3 2.4697(14) T–O7 1.6030(6) X–O5 ×3 2.7345(11) T–O6 1.6019(7) X–O4 ×3 2.8250(12) T–O4 1.6239(4) <X–O> 2.676(1) T–O5 1.6405(5)     <T–O> 1.6173(6) Y–O1
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AVERAGE COMPOSITION OF <b>OXY</b>-<b>DRAVITE</b> AT THE BELUGA OCCURRENCE
Published: 01 July 2017
TABLE 6. AVERAGE COMPOSITION OF OXY-DRAVITE AT THE BELUGA OCCURRENCE
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BORON ISOTOPE COMPOSITION OF <b>OXY</b>-<b>DRAVITE</b> FROM THE BELUGA OCCURRENCE
Published: 01 July 2017
TABLE 9. BORON ISOTOPE COMPOSITION OF OXY-DRAVITE FROM THE BELUGA OCCURRENCE
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Boron isotope composition of Beluga <b>oxy</b>-<b>dravite</b> compared to tourmaline from...
Published: 01 July 2017
Fig. 18. Boron isotope composition of Beluga oxy-dravite compared to tourmaline from different environments. Sources of data: (1) Swihart & Moore 1989 , (2) Palmer 1991 , (3) serendibite-rich calc-silicate rock interpreted to be metamorphosed illite layer deposited in a hypersaline
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Raman spectrum of the <b>oxy</b>-<b>dravite</b> showcase sample S50 in the spectral regio...
Published: 01 November 2016
Figure 6 Raman spectrum of the oxy-dravite showcase sample S50 in the spectral region of the framework and OH-stretching vibrations. Peak positions and selected integrated intensities are given above the peaks. Gray lines illustrate the fit functions; integrated intensities used for chemical
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Photograph of bosiite and <b>oxy</b>-<b>dravite</b> from the Darasun gold deposit (field ...
Published: 01 June 2016
Fig. 2 Photograph of bosiite and oxy-dravite from the Darasun gold deposit (field of view ~3×4 mm 2 ). (online version in colour)
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Back-scattered electron (BSE) image of bosiite (Tur I) and <b>oxy</b>-<b>dravite</b> (Tur...
Published: 01 June 2016
Fig. 4 Back-scattered electron (BSE) image of bosiite (Tur I) and oxy-dravite (Tur II) in quartz (Qtz) from the Darasun gold deposit.
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Proton locations and H-bonding scheme in <b>oxy</b>-<b>dravite</b> based on the neutron s...
Published: 01 June 2014
F ig . 2. Proton locations and H-bonding scheme in oxy-dravite based on the neutron structure refinement of this study. The two configurations of the H-bonding scheme with the H1 site located on ( left side ) and off ( right side ) the three-fold axis are shown. Displacement probability factor