| Reference Type | Journal (article/letter/editorial) |
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| Title | Lucchesiite, CaFe2+3Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup |
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| Journal | Mineralogical Magazine |
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| Authors | Bosi, Ferdinando | Author |
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| Skogby, Henrik | Author |
| Ciriotti, Marco E. | Author |
| Gadas, Petr | Author |
| Novák, Milan | Author |
| Cempírek, Jan | Author |
| Všianský, Dalibor | Author |
| Filip, Jan | Author |
| Year | 2017 (February) | Volume | 81 |
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| Page(s) | 1-14 | Issue | 1 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2016.080.067Search in ResearchGate |
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| Mindat Ref. ID | 244856 | Long-form Identifier | mindat:1:5:244856:9 |
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| GUID | cf714cab-fc18-423a-acf1-b14877184d1b |
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| Full Reference | Bosi, Ferdinando, Skogby, Henrik, Ciriotti, Marco E., Gadas, Petr, Novák, Milan, Cempírek, Jan, Všianský, Dalibor, Filip, Jan (2017) Lucchesiite, CaFe2+3Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup. Mineralogical Magazine, 81 (1) 1-14 doi:10.1180/minmag.2016.080.067 |
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| Plain Text | Bosi, Ferdinando, Skogby, Henrik, Ciriotti, Marco E., Gadas, Petr, Novák, Milan, Cempírek, Jan, Všianský, Dalibor, Filip, Jan (2017) Lucchesiite, CaFe2+3Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup. Mineralogical Magazine, 81 (1) 1-14 doi:10.1180/minmag.2016.080.067 |
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| Abstract/Notes | AbstractLucchesiite, 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 groupR3m,a≈ 16.00 Å,c≈ 7.21 Å,V≈ 1599.9 Å3,Z= 3. The crystal structure of lucchesiite was refined toR1 ≈ 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]∑1.00andX(Ca0.49Na0.45□0.05K0.01)∑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 substitutionZAl3++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). |
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