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• W4281736122 abstract "Abstract Uvite, CaMg 3 (Al 5 Mg)(Si 6 O 18 )(BO 3 ) 3 (OH) 3 (OH), is a new mineral of the tourmaline supergroup. It occurs in the Facciatoia quarry, San Piero in Campo, Elba Island, Italy (42°45′04.55″N, 10°12′50.89″E) at the centre of a narrow (2–3 cm wide) vein composed of aggregates of dark brown to black tourmaline, penetrating (magnesite + dolomite)-rich hydrothermally altered metaserpentinite. Crystals are euhedral and up to 1 cm in size, brown with a vitreous lustre, conchoidal fracture and grey streak. Uvite has a Mohs hardness of ~7½, a calculated density of 3.115 g/cm 3 and is uniaxial (–). Uvite has trigonal symmetry, space group R 3 m , a = 15.9519(10) Å, c = 7.2222(5) Å, V = 1597.3(1) Å 3 and Z = 3. The crystal structure was refined to R 1 = 1.77% using 1666 unique reflections collected with Mo K α X-rays. Crystal-chemical analysis resulted in the empirical crystal-chemical formula $^X ({rm Ca}_{0.61}{rm Na}_{{0.35}} square_{{0.04}})_{Sigma 1.00}{}^{Y} left( {{rm Mg}_{1.50}{rm Fe}^{2 + }_{0.47} {rm Al}_{0.71}{rm Fe}^{3 + }_{0.14} {rm Ti}_{0.18}} right)_{Sigma 3.00}$ ${}^{Z} left( {{rm Al}_{4.54}{rm Fe}^{3 + }_{0.18} {rm V}^{3 + }_{0.02} {rm Mg}_{1.27}} right)_{Sigma 6.00}{}^{T}left[ {{left( {{rm Si}_{5.90}{rm Al}_{0.10}} right)}_{Sigma 6.00}{rm O}_{18}} right]{rm } left( {rm BO_3} right)_3^{} {^{rm O(3)}}left( {rm OH} right)_3{}^{{rm O}left( 1 right)} [left( {rm OH} right)_{0.55}{rm F}_{0.05}{rm O}_{0.40}]_{Sigma 1.00}$ which recast in its ordered form for classification purposes is: $$eqalign{& ^{rm X} ({rm Ca}_{0.61}{rm Na}_{0.35}squ _{0.04})_{Sigma 1.00}{}^{rm Y} left( {{rm Mg}_{2.35}{rm Fe}^{2 + }_{0.47} {rm Ti}_{0.18}} right)_{Sigma 3.00} cr & {}^{rm Z} left( {{rm Al}_{5.25}{rm Fe}^{3 + }_{0.32} {rm V}^{3 + }_{0.02} {rm Mg}_{0.42}} right)_{Sigma 6.00}{}^{rm T} left[ {{left( {{rm Si}_{5.90}{rm Al}_{0.10}} right)}_{Sigma 6.00}{rm O}_{18}} right]{rm }left( {rm BO_3} right)_3{}^{rm V} left( {rm OH} right)_3{}^{rm W} [left( {rm OH} right)_{0.55}{rm F}_{0.05}{rm O}_{0.40}]_{Sigma 1.00}}$$ Uvite is a hydroxy-species belonging to the calcic-group of the tourmaline supergroup. The closest end-member compositions of valid tourmaline species are fluor-uvite and feruvite, to which uvite is related by the substitutions W (OH) – ↔ W F – and Y Mg 2+ ↔ Y Fe 2+ , respectively. The occurrence of a solid-solution between uvite and magnesio-lucchesiite, according to the substitution Z Mg 2+ + W (OH) – ↔ Z Al 3+ + W O 2– , is supported by experimental data. The new mineral was approved by the IMA–CNMNC (IMA 2019-113). Uvite from Facciatoia formed by the reaction between B-rich fluids, released during the crystallisation process of LCT pegmatites, and the surrounding metaserpentinites, altered by contact metamorphism in the aureole of the Miocene Mt. Capanne monzogranitic pluton." @default.
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• W4281736122 date "2022-05-31" @default.
• W4281736122 modified "2023-09-26" @default.
• W4281736122 title "Uvite, CaMg₃(Al₅Mg)(Si₆O₁₈)(BO₃)₃(OH)₃(OH), a new, but long-anticipated mineral species of the tourmaline supergroup from San Piero in Campo, Elba Island, Italy" @default.
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• W4281736122 doi "https://doi.org/10.1180/mgm.2022.54" @default.
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