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schorl

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Journal Article
Published: 01 March 2022
American Mineralogist (2022) 107 (3): 495–508.
..., we performed systematic investigations of in situ boron isotopic and elemental compositions of tour-malines in different granite, greisen, and quartz veins by EPMA and LA-MC-ICP-MS. Results show that almost all tourmalines exhibit schorl compositional affinity with extremely low Ca contents, high Fe...
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Journal Article
Published: 01 February 2022
American Mineralogist (2022) 107 (2): 157–166.
... in Å ( I ) hkl ] are: 2.5534 (100) 051, 3.9508 (85) 220, 2.9236 (78) 122, 4.1783 (61) 211, 2.4307 (55) 012, 2.0198 (39) 152, 1.8995 (30) 342, 6.294 (28) 101. The most common associated minerals are quartz, albite, microcline, and apatite. Beryl and, in places, schorl are also found as primary pegmatitic...
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Journal Article
Published: 28 January 2021
The Canadian Mineralogist (2020) 58 (6): 717–732.
.... The pegmatite has a typical zonal internal structure with a volumetrically significant quartz core and pods of magmatic fluorite. Along with biotite, mostly in the outer units, tourmaline (schorl, fluor-schorl) is common to abundant in most pegmatite units. Accessory minerals include common strongly hematitized...
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Journal Article
Published: 01 September 2020
American Mineralogist (2020) 105 (9): 1436–1440.
...-plateau age of 43 ± 6 Ma. Major element concentrations of tourmaline indicate that both Tur P and Tur G belong to the schorl group with a magmatic origin, but trace elements such as V indicate that they are not cogenetic. Boron isotopes suggest that Tur P (average –9.76‰) was derived from typical crustal...
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Journal Article
Journal: Economic Geology
Published: 18 August 2020
Economic Geology (2020) 115 (8): 1665–1697.
... composition, with Fe/(Fe + Mg) = 0.36 to 0.52, close to the schorl-dravite limit, and relatively high contents (10s to 100s ppm) of Li, K, Mn, light rare earth elements, and Zn. The second generation (Tur 2)—the most important volumetrically—is pre-ore, high-temperature (>500°C), hydrothermal tourmaline...
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Journal Article
Published: 02 June 2020
The Canadian Mineralogist (2020) 58 (3): 381–394.
... tusionite, and schorl. It often grows together with Sc-bearing tusionite and occurs as single columnar crystals ranging from 50 to 400 μm in length, as inclusions in spessartine and tourmaline, and rarely as crystals in blebs along boundaries between garnet, tourmaline, and quartz. Badakhshanite-(Y...
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Journal Article
Published: 13 February 2020
Mineralogical Magazine (2020) 84 (2): 301–311.
...–Karavshinskoye Sn deposit, Turkestan Range, Kyrgyzstan. It occurs as white or pale yellowish rosette-like aggregates that are composed of tiny curved plates up to 20–30 μm. Akopovaite is associated with gibbsite, quartz, albite, microcline, muscovite, montebrasite, siderite, schorl and birnessite-like Fe–Mn...
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Journal Article
Published: 11 November 2019
Mineralogical Magazine (2020) 84 (2): 245–265.
.... Tourmaline formed in three distinct stages with different types of chemical substitution. Tourmaline from the first unmineralised stage is classified as dravite or schorl, which could be enriched locally in Ca, the X -site vacancy and F. This tourmaline is characterised by the Fe ↔ Mg and X vacancy + Al ↔ Na...
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Journal Article
Published: 30 September 2019
The Canadian Mineralogist (2019) 57 (5): 745–747.
...-free ( Selway et al . 1999 ). We found Ti-rich tourmalines in three distinct paragenetic types: (i) Ca-enriched schorl-dravite associated with Kfs + Pl/Ab + Qz ± Ttn, Bt from several localities of intragranitic NYF pegmatites of the Třebíč Pluton, Moldanubian Zone, Czech Republic ( Novák et al . 2011...
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Series: Geological Society, London, Special Publications
Published: 25 September 2019
DOI: 10.1144/SP481-2017-167
EISBN: 9781786204264
.... Representative electron-microprobe chemical compositions (wt%) and recalculated formulae (apfu) of tourmalines (tur) from the Puga gneiss Schorl Schorl Schorl Schorl Dravite Dravite tur I tur I tur II tur II SiO 2 34.06 34.30 35.92 34.99 35.81 35.34 TiO 2 0.72 0.98...
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Journal Article
Published: 01 September 2019
European Journal of Mineralogy (2019) 31 (5-6): 919–928.
... behaviour and to carry out kinetics analysis for Fe-rich tourmaline (schorl). X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetry-Differential Scanning Calorimetry (TG-DSC) were applied to characterize the thermal behaviour. The Friedman, Flynn-Wall-Ozawa, modified...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 20 December 2018
Lithosphere (2019) 11 (1): 91–128.
...-microcline-schorl (line rock).” Later, Shigley (1991 , p. 132) described the Stewart pegmatite zones as “mineral assemblages arranged in subparallel, originally sub horizontal (but now tilted) layered zones above and below a discontinuous quartz spodumene core.” He described seven zones in the dike, three...
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Journal Article
Published: 23 October 2018
The Canadian Mineralogist (2018) 56 (4): 425–449.
... are famous for spectacular mineral specimens of schorl, foitite, aquamarine, topaz, fluorite, and jeremejevite. Mineral samples from three areas where artisanal mining exposed miarolitic cavities were examined: Lion's Head (LH), Hohenstein Gorge (HG), and Tubusis (TB). Tourmaline, biotite, and associated...
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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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Series: Clay Minerals Society
Published: 01 January 2018
DOI: 10.1346/CMS-WLS-22.8
EISBN: 9781881208495
... rather than amorphous nature of the iron oxide. Table 4. Mineralogy (wt.%) of the middlings from the same six samples as in Table 3 . Not shown are less than trace amounts of pyrite, anatase, and rutile. Sample Kaolinite Illite Chlorite Quartz K-feldspar Ankerite Siderite Schorl...
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Journal Article
Published: 01 May 2017
European Journal of Mineralogy (2017) 29 (2): 257–267.
..., and a transversely zoned specimen consisting of small crystals covering the single-crystal main body. The results show that the most abundant tourmaline species are schorl deficient in W-site OH ( W OH) and Y Al-rich schorl that additionally contains minor amounts of Y Mg and/or Y Li. In addition, X Na-rich foitite...
Journal Article
Published: 01 April 2017
American Mineralogist (2017) 102 (4): 876–899.
... and cavities. The tourmalines are mostly schorl (Fe-rich) and foitite, with an average end-member component of schorl 45 dravite 6 tsilaisite 1 uvite 0 Fe-uvite 3 foitite 31 Mg-foitite 4 olenite 10 . Element substitutions of the tourmalines are controlled by FeMg −1 , Y Al X □(R 2+ Na) −1 , and minor Y AlO(R 2...
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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 March 2016
European Journal of Mineralogy (2016) 28 (1): 163–177.
...Andreas Ertl; Uwe Kolitsch; M. Darby Dyar; Hans-Peter Meyer; George R. Rossman; Darrell J. Henry; Markus Prem; Thomas Ludwig; Lutz Nasdala; Christian L. Lengauer; Ekkehart Tillmanns; Gerhard Niedermayr Abstract Fluor-schorl, NaFe 2+ 3 Al 6 Si 6 O 18 (BO 3 ) 3 (OH) 3 F, is a new mineral species...
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Journal Article
Published: 17 November 2015
The Canadian Mineralogist (2015) 53 (3): 571–590.
... likely occurs in arrangements with W OH. §   Corresponding author e-mail address : bacikp@fns.uniba.sk 8 10 2014 21 4 2015 2015 Mineralogical Association of Canada tourmaline supergroup schorl dravite disorder octahedral sites unit-cell parameters bond-lengths bond...
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