FLUOR-DRAVITE, NaMg3Al6Si6O18(BO3)(3)(OH)(3)F, A NEW MINERAL SPECIES OF THE TOURMALINE GROUP FROM THE CRABTREE EMERALD MINE, MITCHELL COUNTY, NORTH CAROLINA: DESCRIPTION AND CRYSTAL STRUCTURE (Articolo in rivista)

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  • FLUOR-DRAVITE, NaMg3Al6Si6O18(BO3)(3)(OH)(3)F, A NEW MINERAL SPECIES OF THE TOURMALINE GROUP FROM THE CRABTREE EMERALD MINE, MITCHELL COUNTY, NORTH CAROLINA: DESCRIPTION AND CRYSTAL STRUCTURE (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.3749/canmin.49.1.57 (literal)
Alternative label
  • Clark C.M. [1]; Hawthorne F. C. [1]; Ottolini L. [2] (2011)
    FLUOR-DRAVITE, NaMg3Al6Si6O18(BO3)(3)(OH)(3)F, A NEW MINERAL SPECIES OF THE TOURMALINE GROUP FROM THE CRABTREE EMERALD MINE, MITCHELL COUNTY, NORTH CAROLINA: DESCRIPTION AND CRYSTAL STRUCTURE
    in Canadian mineralogist
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Clark C.M. [1]; Hawthorne F. C. [1]; Ottolini L. [2] (literal)
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  • 57 (literal)
Pagina fine
  • 62 (literal)
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  • ID GEO:cnr.igg/2011-A0-007 (literal)
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  • 49 (literal)
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  • 1 (literal)
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  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • [1] Univ Manitoba, Dept Geol Sci, Winnipeg, MB R3T 2N2, Canada [2] Univ Pavia, Ist Geosci & Georisorse, Consiglio Naz Ric, I-27100 Pavia, Italy (literal)
Titolo
  • FLUOR-DRAVITE, NaMg3Al6Si6O18(BO3)(3)(OH)(3)F, A NEW MINERAL SPECIES OF THE TOURMALINE GROUP FROM THE CRABTREE EMERALD MINE, MITCHELL COUNTY, NORTH CAROLINA: DESCRIPTION AND CRYSTAL STRUCTURE (literal)
Abstract
  • Fluor-dravite, NaMg3Al6Si6O18(BO3)(3)(OH)(3)F, is a new mineral species of the tourmaline group from the Crabtree emerald mine, Mitchell County, North Carolina, U. S. A. It occurs as isolated anhedral grains up to a few mm across at or near the boundary of a small body of granitic pegmatite with the surrounding country-rock, and is associated with plagioclase, K-feldspar, quartz, beryl, muscovite, garnet, biotite and fluorite. Crystals are blackish brown with a pale brown streak. Fluor-dravite is brittle and has a Mohs hardness of 7; it is non-fluorescent, has no observable cleavage or parting, and has a calculated density of 3.120 g cm(-3). In plane-polarized light, it is pleochroic, O = pale yellow-brown, E = colorless. Fluor-dravite is uniaxial negative, omega = 1.645(2), epsilon = 1.621(2). Fluor-dravite is rhombohedral, space group R3m, a = 15.955(3), c = 7.153(2) angstrom, V = 1576.9(6) angstrom(3), Z = 3. The strongest ten X-ray-diffraction lines in the powder pattern [d in angstrom(I)(hkl)] are: 3.475(100)(102), 2.583(67)(051), 2.961(60) (212), 1.920(27)(432), 3.998(22)(220), 6.375(19)(011), 2.043(19)(512), 2.392(14)(003), 2.123(14)(303) and 1.660(14)(063). Analysis by a combination of electron microprobe, SIMS and crystal-structure refinement gives SiO2 36.02, Al2O3 31.69, TiO2 0.25, FeO 6.41, MnO 0.67, ZnO 0.05, MgO 7.71, CaO 0.25, Na2O 2.80, B2O3 calc 10.86, Li2Ocalc 0.20, F 1.45, H2O 3.19, sum 100.94 wt%. The formula unit is (Na0.88Ca0.04)Sigma(0.92) (Mg1.87Fe0.87Mn0.09Zn0.01Ti0.03Li0.13) Sigma(3.00) Al-6 (Si5.87B0.05Al0.08) O-18 (BO3)(3) (OH)(3) [(OH)(0.47)F-0.75)]Sigma(1.22). Fluor-dravite, ideally NaMg3Al6Si6O18(BO3)(3) (OH)(3)F, is related to end-member dravite, ideally NaMg3Al6Si6O18(BO3)(3)(OH)(3)(OH)->, by the substitution F (OH). (literal)
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