 | | Journal (article/letter/editorial) | | to youngest, generation I (tourmaline), II (dumortierite + tourmaline), and III (tourmaline) veins. Alkali-...planes of these folds. Long axes of fibrous dumortierite and prismatic tourmaline of generation II veins...generation II veins is rich in an “oxy-foitite” component. Foitite-rich tourmaline in generation III veins...Keywords: Singhbhum shear zone, kyanite, foitite, “oxy-foitite,” boron-infiltration iNtroductioN Rocks...tourmaline end-members e.g., olenite (Al: 9 apfu), foitite (Al: 7 apfu), and magnesiofoitite (Al: 7 apfu) |  | | Journal (article/letter/editorial) | | green tourmaline (hat morphology). Here, Na-rich foitite fibers initially develop acicular morphology and...fluor-elbaite on elbaite. Sample locality: Pederneira Mine, Minas Gerais, Brazil. (d) Tourmaline fibers as fibrous...within the elbaite host. Sample locality: Cruzeiro Mine, Minas Gerais, Brazil. either as hair-like curved...fluor-elbaite X-site vacant group foitite ‘‘A-Fe-O root name’’* magnesio-foitite ‘‘A-Mg-O root name’’* (X)...activityactivity diagrams that include magnesio-foitite in this diagenetic environment. The occurrence |  | | Journal (article/letter/editorial) | | °C, however never as a single phase product; dumortierite with either quartz or with jeremejeviteOH were...or in their metamorphic equivalents such as dumortierite quartzites. An unusually Al-rich, complex tourmaline...of the above end-member together with schörl, foitite and rossmanite components. Key-words: Al-tourmalinewith...MgAl-tourmaline was defined from nature and named foitite (MacDonald et al., 1993). The fact that this natural...in ternary solid solutions. Thus, this natural foitite may still be classified in the “X-site vacancy |  | | Journal (article/letter/editorial) | | dravite – foitite solid solutions), prismatine, grandidierite, werdingite, boralsilite and dumortierite. Tourmaline...600°C at ~3 kbar for secondary tourmaline and dumortierite, conditions consistent with the presence of...andalusite. Keywords: schorl, dravite, foitite, dumortierite, grandidierite, tourmaline, granitic pegmatite...prismatine, grandidierite, werdingite, boralsilite et dumortierite. On se sert de la tourmaline pour obtenir de...kbar, champ de stabilité de la tourmaline et dumortierite secondaires, à des conditions conformes à la |  | Bačík, Peter, Ertl, Andreas, Števko, Martin, Giester, Gerald, Sečkár, Peter (2015) ACICULAR ZONED TOURMALINE (MAGNESIO-FOITITE TO FOITITE) FROM A QUARTZ VEIN NEAR TISOVEC, SLOVAKIA: THE RELATIONSHIP BETWEEN CRYSTAL CHEMISTRY AND ACICULAR HABIT. The Canadian Mineralogist, 53 (2) 221-234 doi:10.3749/canmin.1400085 | Journal (article/letter/editorial) | | 1400085 ACICULAR ZONED TOURMALINE (MAGNESIO-FOITITE TO FOITITE) FROM A QUARTZ VEIN NEAR TISOVEC, SLOVAKIA:...oxy-dravitic compositions, shifting to magnesio-foitite in the middle parts of the crystals and to foititic...magnesio-foitite, and the Al◻(Fe,Mg)–1Na–1 substitution prevails in the magnesio-foitite and foitite compositions...considered. Keywords: tourmaline, magnesio-foitite, foitite, EMPA, SREF, crystal chemistry, acicular habit...habit. INTRODUCTION Magnesio-foitite, ◻(Mg2Al)Al6(Si6O18)(BO3)3(OH)3 (OH), is one of the tourmaline-supergroup |  | | Journal (article/letter/editorial) | | (2000) COMPLEXLY ZONED FIBROUS TOURMALINE, CRUZEIRO MINE, MINAS GERAIS, BRAZIL: A RECORD OF EVOLVING MAGMATIC...with a deep pink elbaite host from the Cruzeiro mine, Minas Gerais, Brazil, provide evidence for the...preserved in the fiber interior, is a dark blue foitite; the blue-gray second generation varies from Fe-rich...tourmaline, tourmaline dissolution, foitite, elbaite, fluids, Cruzeiro mine, Minas Gerais, Brazil. SOMMAIRE...intercroissance avec une elbaïte rose foncé, provenant de la mine Cruzeiro, province de Minas Gerais, au Brésil, permettent |  | | Journal (article/letter/editorial) | | Canadian Mineralogist Vol. 38, pp. 1399-1408 (2000) FOITITE: FORMATION DURING LATE STAGES OF EVOLUTION OF COMPLEX...ABSTRACT Zoned crystals of tourmaline (elbaite–foitite) were found in pockets of the lepidolite-subtype...western Moravia, Czech Republic, and the White Queen mine, Pala, San Diego County, California. Zoned crystals...Fe-rich elbaite, and dark violet to black foitite. Elbaite– foitite is associated with quartz, cookeite, albite...and muscovite at the White Queen mine. Chemical compositions of foitite and associated Fe-poor to Fe-rich |  | Cempirek, J., Novak, M., Dolnicek, Z., Kotkova, J., Skoda, R. (2010) Crystal chemistry and origin of grandidierite, ominelite, boralsilite, and werdingite from the Bory Granulite Massif, Czech Republic. American Mineralogist, 95 (10) 1533-1547 doi:10.2138/am.2010.3480 | Journal (article/letter/editorial) | | grandidierite, ominelite, boralsilite, werdingite, dumortierite (locally Sb,Ti-rich), tourmaline, and corundum...Mg)1.22Al14.86B4.25Si3.55O37. Dumortierite and Sb,Ti-rich dumortierite occur as zoned crystals with zones...(XFe = 0.44–0.75) of the schorlmagnesiofotite-foitite-olenite solid solution occurs as a replacement...kornerupine-prismatine series, tourmaline or dumortierite (e.g., Huijsmans et al. 1982; Grew 1996; Grew...most common borosilicates (e.g., tourmaline, dumortierite, kornerupine, grandidierite, werdingite) were |  | | Journal (article/letter/editorial) | | common oxy-schorl, minor oxy-dravite and rare oxy-foitite are more abundant relative to the relevant members...schorl, oxy-schorl, dravite, oxy-dravite, oxy-foitite, wet-chemical analyses, substitution mechanisms...(Li,Ca,F)-poor tourmaline of the schorl-dravite-foitite series in granitic melts are discussed. Geological...tourmaline; fluorapatite, cordierite, andalusite, dumortierite, almandine > spessartine, pyrrhotite, ilmenite...works on tourmaline identified schorl, schorl-foitite to schorl-dravite associated with muscovite occurring |  | Gadas, P., Novak, M., Stanek, J., Filip, J., Galiova, M. V. (2012) Compositional Evolution of Zoned Tourmaline Crystals from Pockets in Common Pegmatites of the Moldanubian Zone, Czech Republic. The Canadian Mineralogist, 50 (4) 895-912 doi:10.3749/canmin.50.4.895 | Journal (article/letter/editorial) | | pleochroism) and in BSE images: core (foitite – schorl – magnesio-foitite), intermediate zone (schorl – dravite)...is relatively homogeneous (dravite – magnesio-foitite). A slight decrease in X-site vacancy, in Fetot/(Fetot...granitic pegmatites. Keywords: foitite, schorl, dravite, magnesio-foitite, compositional evolution, zoning...and Fe in the simplified sequence dravite–schorl–foitite ! schorl–olenite ! schorl–elbaite ! elbaite ! rossmanite...show the compositional trend foitite ! schorl ! dravite ! magnesio-foitite from core to rim, both parallel |  | | Journal (article/letter/editorial) | | unknowns. 370 ROCKS & MINERALS Tourmaline and dumortierite are the two most common borosilicates in pegmatites...from the Kinkel quarry in Bedford, New York, has foitite formed in cavities or as an extension of the schorl...Zn, Ga, Ge, Sr, LREEs, and Pb than associated foitite, whereas Co, Ni, Zn, Zr, In, Cd, and Sb are of...were not detected in either tourmaline species. Dumortierite is an important mineral of the abyssal class...substitutions of Fe, Mg, and Ti for Al, and P for Si. Dumortierite from Benson Mines, New York, shows the highest |  | Grew, Edward S., McGee, James J., Yates, Martin G., Peacor, Donald R., Rouse, Roland C., Huijsmanns, Joep P. P., Shearer, Charles K., Wiedenbeck, Michael, Thost, Douglas E., Su, Shu-Chun (1998) Boralsilite (Al16B6Si2O37); a new mineral related to sillimanite from pegmatites in granulite-facies rocks. American Mineralogist, 83 (5) 638-651 doi:10.2138/am-1998-5-624 | Journal (article/letter/editorial) | | potassiumfeldspar-plagioclase(An,,)boralsilite-werdingite-dumortierite-grandidierite(Almgjotheii); (3) quartz-potassiumfeld*...(Almgjotheii). Boralsilite is estimated spar-boralsilite-dumortierite-andalusite to have formed between 600 and 750...Andalusite(And) Tourmaline(Tur) (Gdd) Grandidierite Dumortierite(Dum) Rose,high-Ti Blue to purple,low-Ti Werdingite(Wrd)...finer-grained (<2 mm) blue to purple variety of dumortierite is closely associatedwith boralsilite (e.g....associatedwith quartz, potassium feldspar, plagioclase,dumortierite, grandidierite, tourmaline, andalusite,and possibly |  | Garofalo, P., Audétat, A., Günther, D., Heinrich, C. A., Ridley, J. (2000) Estimation and testing of standard molar thermodynamic properties of tourmaline end-members using data of natural samples. American Mineralogist, 85 (1) 78-88 doi:10.2138/am-2000-0109 | Journal (article/letter/editorial) | | calorimetric data for a natural Mg-rich tourmaline and dumortierite, a structurally similar borosilicate, to estimate...enthalpy and entropy, and reactions involving dumortierite to estimate the heat-capacity functions. This...have been formulated that involve a natural dumortierite, a B silicate structurally analogous to tourmaline...Australia). CRYSTAL CHEMISTRY OF TOURMALINE AND DUMORTIERITE The generalized structural formula of tourmaline...behavior of the solid solution (Navrotsky 1987). Dumortierite is the borosilicate mineral with the closest |  | | Journal (article/letter/editorial) | | oxy-uvite, CaMg3Al6(Si6O18)(BO3)3(OH)3O, and oxy-Mg-foitite, &(MgAl2)Al6(Si6O18)(BO3)3(OH)3O. The amount of...8)(BO3)3(OH)3O, Mg-foitite &(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH) and oxy-Mg-foitite &(MgAl2)Al6(Si6O18)(BO3)3(OH)3O...(hydroxy-uvite ± Mg-foitite) Mg2 H Al3 (hydroxy-uvite ± oxy-uvite; Mg-foitite ± oxy-Mg-foitite) Mg2 Ca2...Ca2 Al3 H & (oxy-uvite ± Mg-foitite). Although tourmaline nearly approaching the end-member composition...composition has been reported (Mg-foitite by Towatana, 1985; foitite by MacDonald and Hawthorne, 1993; |  | Zhang, A. C., Wang, R. C., Hu, H., Chen, X. M., Zhang, H. (2004) OCCURRENCES OF FOITITE AND ROSSMANITE FROM THE KOKTOKAY NO. 3 GRANITIC PEGMATITE DYKE, ALTAI, NORTHWESTERN CHINA: A RECORD OF HYDROTHERMAL FLUIDS. The Canadian Mineralogist, 42 (3) 873-882 doi:10.2113/gscanmin.42.3.873 | Journal (article/letter/editorial) | | Mineralogist Vol. 42, pp. 873-882 (2004) OCCURRENCES OF FOITITE AND ROSSMANITE FROM THE KOKTOKAY NO. 3 GRANITIC...ABSTRACT Two species of X-site-vacant tourmalines, foitite and rossmanite, occur in the Koktokay No. 3 granitic...northwestern China, a spodumene-subtype pegmatite. Foitite–schorl crystals develop as fillings in the interstices...Y+Z R = Fetot + Mg + Mn + Zn). The second-stage foitite–schorl has compositional variations expressed by...formation of foitite–schorl is mainly attributed to pegmatite-derived fluids, the occurrence of foitite further |  | | Journal (article/letter/editorial) | | (solid solutions among schorl, dravite, olenite, foitite and, to a lesser extent, uvite) can be stable from...A case in point is tourmaline from the Himalaya mine, California. The Na and F contents of tourmaline...)3 Si6 O18 (OH)3 F foitite G[Fe2+2 Al]Al6 (BO3 )3 Si6 O18 (OH)3 (OH) magnesio-foitite G[Mg2 Al]Al6 (BO3...thermal stability limits of dravite (magnesio-foitite) in unreversed reactions of (1) cordierite + sillimanite...+ B-bearing aqueous vapor ! dravite (magnesio-foitite) + quartz, and (2) cordierite + albite + B-bearing |  | | Journal (article/letter/editorial) | | K-dravite KMg3Al6Si6O18(BO3)3(OH)3OH, magnesio-foitite o(Mg2Al)Al6Si6O18(BO3)3(OH)3OH, oxy-uvite CaMg...oxy-uvite K0 = 110(2), K0ʹ = 4.1(1); magnesio-foitite K0 = 116(2), K0ʹ = 3.5(1); olenite K0 = 116(6)...presence of a fully vacant X site in magnesio-foitite results in a decrease of K0ʹ relative to the alkali...tourmalines. The decrease in K0ʹ for magnesio-foitite is accounted for by an increase in compressibility...parameters Dravite K-dravite Oxy-uvite Magnesio-foitite Olenite K0 (GPa) K0′ 97(6) 109(4) 110(2) 116(2) |  | | Journal (article/letter/editorial) | | WISCONSIN: OCCURRENCE AND SIGNIFICANCE OF FOITITE AND “OXY-FOITITE” L. GORDON MEDARIS JR.§ AND JOHN H. FOURNELLE...A. ABSTRACT The alkali-deficient tourmaline, foitite [䡺(Fe2+2Al)Al6Si6O18(BO3)3(OH)3(OH)], and associated...demonstrate the likely existence of a dominant “oxy-foitite” component [䡺(Fe2+Al2)Al6Si6O18(BO3)3(OH)3(O)]...more sodic, acidic later stage. Keywords: foitite, “oxy-foitite”, Baraboo Quartzite, Wisconsin, U.S.A. ...tourmaline are important: foitite, magnesiofoitite, and “oxy-foitite” (Table 1). Foitite, which was formally |  | | Journal (article/letter/editorial) | | 1299-1303, 1993 a new alkali-deficient tourmaline: Foitite, nlFe?+(Al,Fe3+)lAluSi6O18(BO3)r(OH)0, Description...Museum of Nature, Ottawa, Ontario KIA 0M8, Canada Foitite is a newtourmaline,o."r"rl"iJTtJnern california...pleochroic, with O : pale lavender and E : dark blue. Foitite is uniaxial negative, with co: 1.664(l), e : 1...formula tr[Fe]*(Al,Fe3*)lAl5Si6O'8@Or).(OH).; thus foitite can be derived from schorl [Naby the substitution...s(BO3)3(OH)4] vacancy. The crystal structure of foitite was refined to an R index of l.60lousing ll28 observed |  | | Journal (article/letter/editorial) | | Canada). They approximate the Mg-equivalent of foitite with an idealized formula [](Mg2A1)A16Si6Ols(BO3)3(OH)4...Mn enrichment, hydrothermal alteration, Sullivan mine, Pb-Zn-Ag deposit, British Columbia. Introduction...Guidotti, 1985). Alkali-deficient tourmaline (foitite) has been reported by Foit et al. (1989) and MacDonald...formula l--q[Fe~+(A1,Fe3+)] A16Si6018(BO3)3(OH)4. Foitite can be derived from ~t~ ~ ~laX)e++All~Sv)i60~ B...Li-tourmaline can be derived either from the foitite formula by the substitution 2Fe 2+ = Li + A1 or |  | | Journal (article/letter/editorial) | | pegmatite groups. a) Dumortierite-bearing dikes (dumortierite + schorl + olenite ± foitite, garnet, kyanite)...(grandidierite–ominelite + boralsilite + werdingite + dumortierite + schorl) cuts leucogranulite of the Bory Granulite...leucosomes (cordierite + biotite + schorl-dravite ± dumortierite) occur in migmatized gneisses of the Bory Granulite...tourmaline (schorl, oxy-schorl, dravite, foitite, magnesio-foitite) typically developed in pockets (Gadas...with tourmaline (schorl, oxy-schorl, dravite, foitite, fluor-elbaite, elbaite, fluor-liddicoatite, rossmanite |  | | Journal (article/letter/editorial) | | ‘B-nepheline’, boromuscovite, danburite, dravite, dumortierite, jeremejevite-OH, kotoite, magnesiodumortierite...accordance with its relatively low water contents dumortierite remains stable up to rather high temperatures...and 850-900°C the solid breakdown products of dumortierite are boron-free phases (kyanite and corundum)...phase. High-pressure experiments showed that dumortierite containing [BO,]-groups remains stable up to...the Mg-analogue of the newly discovered mineral foitite, 0 (Fe’+ Al)Al,[BO,],[Si,O,,l(OH), (MacDonald et |  | | Journal (article/letter/editorial) | | Western Australia; (b) foitite, 11 cm, Garnet Ledge dike, Little Three mine, Ramona, San Diego County...Varieties of elbaite: (c) rubellite, 10 cm, Himalaya mine, Mesa Grande, California, found by Ralph Potter...terminated, 6 cm, 1991 London Pocket, Little Three mine, Ramona, California; (e) indicolite, 5.6 cm, Aracuai...indicolite over rubellite, 4 cm, Tourmaline Queen mine (1972), Pala district, San Diego County, California...as tourmaline, axinite, danburite, datolite, dumortierite, reedmergnerite, and a number of other, much |  | Novák, Milan, Čopjaková, Renata, Dosbaba, Marek, Galiová, Michaela VAŠINOVÁ, Všianský, Dalibor, Staněk, Josef (2015) Two Paragenetic Types of Cookeite From the Dolní Bory-Hatě Pegmatites, Moldanubian Zone, Czech Republic: Proximal and Distal Alteration Products of Li-Bearing Sekaninaite. The Canadian Mineralogist, 53 (6) 1035-1048 doi:10.3749/canmin.1400090 | Journal (article/letter/editorial) | | K-feldspar4fluorapatite, muscovite, and tourmaline (schorl, foitite, dravite). The late minerals in the pockets were...the late 1960s in dumps of the Oldřich pegmatite mine. Beige to grayish aggregates of cookeite, up to...Tourmaline associated with cookeite from dike No. 1 is foitite to schorl (Tables 2 and 3) with high Al (6.45–6...contents (0.19–0.73 wt.%; Table 2) aside from B-rich foitite. Albite shows near endmember composition with very...mineral assemblage muscovite+cookeite+quartz+ foitite+albite+nontronite from dike No. 1 replacing sekaninaite |  | Bačík, Peter, Koděra, Peter, Uher, Pavel, Ozdín, Daniel, Jánošík, Michal (2015) Chlorine-Enriched Tourmalines In Hydrothermally Altered Diorite Porphyry From the Biely Vrch Porphyry Gold Deposit (Slovakia) The Canadian Mineralogist, 53 (4) 673-691 doi:10.3749/canmin.1500013 | Journal (article/letter/editorial) | | ("vacancy-Mg-O root name" tourmaline, magnesio-foitite, and foitite), alkali (oxy-schorl, schorl), and calcic...vacant (‘‘vacancy-Mg-O’’ tourmaline, magnesio-foitite, and foitite), alkali (oxyschorl, schorl), and rarely...responsible for the &-Mg-O-tourmaline, magnesio-foitite, and foitite compositions. The FeCaAl–1Na–1 substitution...chlorine concentrates in early-formed magnesio-foitite and ‘‘&-Mg-O’’ tourmaline (Tur 1), and its proportion...Olenite Olenite Oxy-schorl Oxy-dravite Mg-rich foitite Foitite Oxy-schorl Fluor-buergerite Fluor-buergerite |
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