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Darrellhenryite, Na(LiAl_2)Al_6(BO_3)_3Si_6O_(18)(OH)_3O, a new mineral from the tourmaline supergroup

Novák, Milan and Ertl, Andreas and Povondra, Pavel and Galiová, Michaela Vašinová and Rossman, George R. and Pristacz, Helmut and Prem, Markus and Giester, Gerald and Gadas, Petr and Škoda, Radek (2013) Darrellhenryite, Na(LiAl_2)Al_6(BO_3)_3Si_6O_(18)(OH)_3O, a new mineral from the tourmaline supergroup. American Mineralogist, 98 (10). pp. 1886-1892. ISSN 0003-004X. doi:10.2138/am.2013.4416.

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Darrellhenryite, Na(LiAl_2)Al_6(BO_3)_3Si_6O_(18)(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 ^Y(Al)^W_(0.5)O_1^YLi^W_(−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, ω = 1.636(2), ɛ = 1.619(2), birefringence: 0.017, space group R3m, ɑ = 15.809(2), c = 7.089(1) Å, V = 1534.4(4) Å^3, and Z = 3. The chemical analysis, in combination with the results from the single-crystal structure refinement, gives the formula ^X(Na_(0.58)Ca_(0.01)□_(0.41))_(1.00)^Y(Li_(1.05)Al_(1.95))_(3.00)^ZAl_6 (BO_3)_3^T(Si_6O_(18)) ^V(OH)_3^W(O_(0.66)F_(0.34))_(1.00), which can be simplified to an ideal formula of Na(LiAl_2)Al_6(BO_3)_3Si_6O_(18)(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 D_(meas) = 3.03(3) g/cm^3, D_(calc) = 3.038 g/cm^3. 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.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 2013 Mineralogical Society of America. Manuscript received November 26, 2012. Manuscript accepted May 27, 2013. Manuscript handled by Fernando Colombo. We sincerely thank the reviewers A. McDonald and F. Colombo for their careful reviews of the manuscript as well as the comments of the members of the CNMNC of the IMA, which improved this manuscript significantly. This work was funded by GAP 210/10/0743 (M.N., P.G., and R.Š.) and by the Austrian Science Fund (FWF) project no. P23012-N19 (A.E.) with contributions from NSF grant EAR-0947956 (G.R.R.). M.V.G. acknowledges the European Regional Development Fund project “CEITEC” (CZ.1.05/1.1.00/02.0068).
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
Austrian Science Fund (FWF)P23012-N19
European Regional Development Fund project “CEITEC”CZ.1.05/1.1.00/02.0068
Subject Keywords:Darrellhenryite, tourmaline group, chemical analyses, crystal structure, Nová Ves, Czech Republic
Issue or Number:10
Record Number:CaltechAUTHORS:20131202-144528393
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Official Citation: Milan Novák, Andreas Ertl, Pavel Povondra, Michaela Vašinová Galiová, George R. Rossman, Helmut Pristacz, Markus Prem, Gerald Giester, Petr Gadas, and Radek Škoda Darrellhenryite, Na(LiAl2)Al6(BO3)3Si6O18(OH)3O, a new mineral from the tourmaline supergroup American Mineralogist, October 2013, v. 98, p. 1886-1892, doi:10.2138/am.2013.4416
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42779
Deposited By: Ruth Sustaita
Deposited On:02 Dec 2013 23:38
Last Modified:10 Nov 2021 16:28

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