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Fluor-elbaite, Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F, a new mineral species of the tourmaline supergroup
-
Ferdinando Bosi
,
Giovanni B. Andreozzi
Veröffentlicht/Copyright:
7. März 2015
Abstract
Fluor-elbaite, Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F, is a new mineral of the tourmaline supergroup. It is found in miarolitic cavities in association with quartz, pink muscovite, lepidolite, spodumene, spessartine, and pink beryl in the Cruzeiro and Urubu mines (Minas Gerais, Brazil), and apparently formed from late-stage hydrothermal solutions related to the granitic pegmatite. Crystals are bluegreen with a vitreous luster, sub-conchoidal fracture and white streak. Fluor-elbaite has a Mohs hardness of approximately 7.5, and has a calculated density of about 3.1 g/cm3. In plane-polarized light, fluor-elbaite is pleochroic (O = green/bluish green, E = pale green), uniaxial negative. Fluor-elbaite is rhombohedral, space group R3̄m, a = 15.8933(2), c = 7.1222(1) Å, V = 1558.02(4) Å3, Z = 3 (for the Cruzeiro material). The strongest eight X-ray-diffraction lines in the powder pattern [d in Å(I)(hkl)] are: 2.568(100)(051), 2.939(92)(122), 3.447(67)(012), 3.974(58)(220), 2.031(57)(152), 4.200(49)(211), 1.444(32)(642), and 1.650(31)(063). Analysis by a combination of electron microprobe, secondary ion mass spectrometry, and Mössbauer spectroscopy gives SiO2 = 37.48, Al2O3 = 37.81, FeO = 3.39, MnO = 2.09, ZnO = 0.27, CaO = 0.34, Na2O = 2.51, K2O = 0.06, F = 1.49, B2O3 = 10.83, Li2O = 1.58, H2O = 3.03, sum 100.25 wt%. The unit formula is: X(Na0.78□0.15Ca0.06K0.01)Y(Al1.15Li1.02Fe2+ 0.46Mn2+ 0.28Zn0.03) ZAl6 T(Si6.02O18)B(BO3)3V(OH)3W(F0.76OH0.24).
The crystal structure of fluor-elbaite was refined to statistical indices R1 for all reflections less then 2% using MoKα X-ray intensity data. Fluor-elbaite shows relations with elbaite and tsilaisite through the substitutions WF ↔ WOH and Y(Al + Li) + WF ↔ 2YMn2+ + WOH, respectively.
Keywords : Fluor-elbaite; tourmaline; new mineral species; crystal-structure refinemnet; electron microprobe; ion microprobe; Mössbauer spectroscopy
Received: 2012-7-6
Accepted: 2012-10-24
Published Online: 2015-3-7
Published in Print: 2013-2-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Fluor-elbaite;
tourmaline;
new mineral species;
crystal-structure refinemnet;
electron microprobe;
ion microprobe;
Mössbauer spectroscopy
Artikel in diesem Heft
- Pressure-induced structural transformations in the low-cristobalite form of AlPO4
- Hydrokenomicrolite, (□,H2O)2Ta2(O,OH)6(H2O), a new microlite-group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil
- Fluor-elbaite, Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F, a new mineral species of the tourmaline supergroup
- Microtexture development during rapid cooling in three rhyolitic lava flows
- Microbial and inorganic control on the composition of clay from volcanic glass alteration experiments
- High-pressure experiments on phase transition boundaries between corundum, Rh2O3(II)- and CaIrO3-type structures in Al2O3
- Electronic structure effects in the vectorial bond-valence model
- Geometric analysis of radiation damage connectivity in zircon, and its implications for helium diffusion
- Superstructure, crystal chemistry, and cation distribution in filipstadite, a Sb5+-bearing, spinel-related mineral
- A high-temperature Brillouin scattering study on four compositions of haplogranitic glasses and melts: High-frequency elastic behavior through the glass transition
- Hydrogen isotope fractionation between coexisting hydrous melt and silicate-saturated aqueous fluid: An experimental study in situ at high pressure and temperature
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- Hydration properties of synthetic high-charge micas saturated with different cations: An experimental approach
- Quantitative analyses of powdered multi-minerallic carbonate aggregates using a portable Raman spectrometer
- Periodic ab initio bulk investigation of hydroxylapatite and type A carbonated apatite with both pseudopotential and all-electron basis sets for calcium atoms
- Coexisting pseudobrookite, ilmenite, and titanomagnetite in hornblende andesite of the Coleman Pinnacle flow, Mount Baker, Washington: Evidence for a highly oxidized arc magma
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- Lead-tellurium oxysalts from Otto Mountain near Baker, California: IX. Agaite, Pb3Cu2+Te6+O5(OH)2(CO3), a new mineral with CuO5-TeO6 polyhedral sheets
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