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Lucchesiite, CaFe2+3Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup

Published online by Cambridge University Press:  02 January 2018

Ferdinando Bosi ,
Henrik Skogby ,
Marco E. Ciriotti ,
Petr Gadas ,
Milan Novák ,
Jan Cempírek ,
Dalibor Všianský  and
Jan Filip
Ferdinando Bosi*
Affiliation:
Dipartimento di Scienze della Terra, Sapienza Università di Roma, Piazzale A. Moro, 5, I-00185 Rome, Italy
Henrik Skogby
Affiliation:
Department of Geosciences, Swedish Museum of Natural History, Box 50007, SE-10405 Stockholm, Sweden
Marco E. Ciriotti
Affiliation:
Associazione Micromineralogica Italiana, via San Pietro 55, I-10073 Devesi-Ciriè, Torino, Italy
Petr Gadas
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
Milan Novák
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
Jan Cempírek
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
Dalibor Všianský
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic
Jan Filip
Affiliation:
Regional Centre of Advanced Technologies and Materials, Palacký University, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
*
*E-mail: ferdinando.bosi@uniroma1.it
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Abstract

Lucchesiite, CaFe32+Al6(Si6O18)(BO3)3(OH)3O, is a new mineral of the tourmaline supergroup. It occurs in the Ratnapura District, Sri Lanka (6°35'N, 80°35'E), most probably from pegmatites and in Mirošov near Strážek, western Moravia, Czech Republic, (49°27'49.38"N, 16°9'54.34"E) in anatectic pegmatite contaminated by host calc-silicate rock. Crystals are black with a vitreous lustre, conchoidal fracture and grey streak. Lucchesiite has a Mohs hardnessof ∼7 and a calculated density of 3.209 g/cm3 (Sri Lanka) to 3.243 g/cm3 (Czech Republic). In plane-polarized light, lucchesiite is pleochroic (O = very dark brown and E = light brown) and uniaxial (–). Lucchesiite is rhombohedral, space group R3m, a ≈ 16.00 Å, c ≈ 7.21 Å, V ≈ 1599.9 Å3, Z = 3. The crystal structure of lucchesiite was refined to R1 ≈ 1.5% using ∼2000 unique reflections collected with MoKα X-ray intensity data. Crystal-chemical analysis for the Sri Lanka (holotype) and Czech Republic (cotype) samples resulted in the empirical formulae, respectively: X(Ca0.69Na0.30K0.02)∑1.01Y(Fe1.442+Mg0.72Al0.48Ti0.334+V0.023+Mn0.013+Zn0.01)∑3.00Z(Al4.74Mg1.01Fe0.253+)∑6.00[T(Si5.85Al0.15)∑6.00O18](BO3)3V(OH)3W[O0.69F0.24(OH)0.07]∑1.00and X(Ca0.49Na0.45□0.05 K0.01)∑1.00Y(Fe1.142+Fe0.953+Mg0.42Al0.37Mn0.03Ti0.084+Zn0.01)∑3.00Z(Al5.11Fe0.383+Mg0.52)∑6.00[T(Si5.88Al0.12)∑6.00O18](BO3)3V[(OH)2.66O0.34]∑3.00W(O0.94F0.06)∑1.00.

Lucchesiite is an oxy-species belonging to the calcic group of the tourmaline supergroup. The closest end-member composition of a valid tourmaline species is that of feruvite, to which lucchesiite is ideally related by the heterovalent coupled substitution ZAl3++O1O2– ↔ ZMg2+ + O1(OH)1–. The new mineral was approved by the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification (IMA 2015-043).

Keywords

lucchesiitenew mineral speciescrystal-structure refinementelectron microprobeMössbauer spectroscopyinfrared spectroscopy
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 1 , February 2017 , pp. 1 - 14
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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