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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

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1945-3027
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Volume 98, Issue 10

Issues

Darrellhenryite, Na(LiAl2)Al6(BO3)3Si6O18(OH)3O, a new mineral from the tourmaline supergroup

Milan Novák / Andreas Ertl
  • Institut für Mineralogie und Kristallographie, Geozentrum, Universität Wien, Althanstrasse 14, 1090 Wien, Austria
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/ Pavel Povondra
  • Department of Geochemistry, Mineralogy, and Natural Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
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/ Michaela Vašinová Galiová
  • Department of Chemistry, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
  • Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
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/ George R. Rossman
  • Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125-2500, U.S.A.
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/ Helmut Pristacz
  • Institut für Mineralogie und Kristallographie, Geozentrum, Universität Wien, Althanstrasse 14, 1090 Wien, Austria
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/ Markus Prem
  • Institut für Mineralogie und Kristallographie, Geozentrum, Universität Wien, Althanstrasse 14, 1090 Wien, Austria
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/ Gerald Giester
  • Institut für Mineralogie und Kristallographie, Geozentrum, Universität Wien, Althanstrasse 14, 1090 Wien, Austria
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/ Petr Gadas
  • Department of Geological Sciences, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
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/ Radek Škoda
  • Department of Geological Sciences, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
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Published Online: 2015-03-07 | DOI: https://doi.org/10.2138/am.2013.4416

Abstract

Darrellhenryite, Na(LiAl2)Al6(BO3)3Si6O18(OH)3O, a new member of the tourmaline supergroup (related to the alkali-subgroup 4), is a new Li-bearing tourmaline species, which is closely related to elbaite through the substitution YAlW 0.5O1YLiW -0.5(OH)-1. It occurs in a complex (Li-bearing) petalite-subtype pegmatite with common lepidolite, Li-bearing tourmalines, and amblygonite at Nová Ves near Český Krumlov, southern Bohemia, Moldanubian Zone, Czech Republic. This zoned pegmatite dike cross-cuts a serpentinite body enclosed in leucocratic granulites. Pink darrellhenryite forms columnar crystals (sometimes in parallel arrangement) up to 3 cm long and up 2 cm thick, associated with albite (var. cleavelandite), minor quartz, K-feldspar, petalite, rare polylithionite, and locally rare pollucite. The optical properties and the single-crystal structure study (R1 = 0.019) of darrellhenryite are consistent with trigonal symmetry, w = 1.636(2), e = 1.619(2), birefringence: 0.017, space group R3m, a = 15.809(2), c = 7.089(1) Å, V = 1534.4(4) Å3, and Z = 3. The chemical analysis, in combination with the results from the single-crystal structure refinement, gives the formula X(Na0.58Ca0.010.41)1.00Y(Li1.05Al1.95)3.00ZAl6 (BO3)3T(Si6O18) V(OH)3W(O0.66F0.34)1.00, which can be simplified to an ideal formula of Na(LiAl2) Al6(BO3)3Si6O18(OH)3O. The strongest lines of the powder pattern [d in Å (I, hkl)] are 4.180 (39, 211), 3.952 (54, 220), 3.431 (73, 012), 2.925 (100, 122), 2.555 (90, 051), 2.326 (42, 511), 2.029 (42, 223), 2.021 (42, 152), 1.901 (50, 342), 1.643 (49, 603). The density is Dmeas = 3.03(3) g/cm3, Dcalc = 3.038 g/ cm3. Darrellhenryite is considered to have crystallized in Li- and B-rich but F-moderate environments in complex pegmatites; no influence of higher activity of O on the darrellhenryite formation is implied from its mineral assemblage. The name is for Darrell J. Henry, Professor of Geology at the Louisiana State University, Baton Rouge, U.S.A., an expert on the mineralogy, petrology, crystal chemistry, and nomenclature of tourmaline-supergroup minerals.

Keywords : Darrellhenryite; tourmaline group; chemical analyses; crystal structure; Nová Ves; Czech Republic

About the article

Received: 2012-11-26

Accepted: 2013-05-27

Published Online: 2015-03-07

Published in Print: 2013-10-01


Citation Information: American Mineralogist, Volume 98, Issue 10, Pages 1886–1892, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2013.4416.

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© 2015 by Walter de Gruyter Berlin/Boston.

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