IMA 2019-022 = bianchiniite

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Marco E. Ciriotti
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IMA 2019-022 = bianchiniite

Messaggio da Marco E. Ciriotti » lun 22 mar, 2021 14:28

Prossima pubblicazione.

Referenza:
▪ Biagioni, C., Pasero, M., Hålenius, U., Bosi, F. (2021): Bianchiniite, Ba2(Ti4+V3+)(As2O5)2OF, a new diarsenite mineral from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy). Mineralogical Magazine, 85, (in press).

Abstract:
The new mineral bianchiniite, Ba2(Ti4+V3+)(As2O5)2OF, has been discovered in the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy. It occus as brown {001} tabular crystals, up to 1 mm in size, with a vitreous luster. It is brittle, with a perfect {001} cleavage. Streak is brownish. In reflected light, bianchiniite is grey, with orange-yellow internal reflections. It is weakly bireflectant, with a very weak anisotropy in shades of grey. Minimum and maximum reflectance data for COM wavelengths [Rmin/Rmin (%), (λ, μm)] are: 5.0/5.8 (470), 5.7/6.5 (546), 5.7/7.0 (589), and 5.2/6.3 (650). Electron microprobe analyses gave (wt% - average of 10 spot analyses): TiO2 10.34, V2O3 3.77, Fe2O3 3.76, As2O3 44.36, Sb2O3 0.22, SrO 0.45, BaO 34.79, PbO 0.28, F 1.77, sum 99.74, O = F –0.75, total 98.99. On the basis of 12 anions per formula unit, the empirical formula of bianchiniite is (Ba2.00Sr0.04Pb0.02)Σ2.06(Ti4+1.14V3+0.44Fe3+0.42)Σ2.00[(As3.96Sb0.02)Σ3.98O10](O1.18F0.82)Σ2.00. Bianchiniite is tetragonal, space group I4/mcm, with unit-cell parameters a = 8.7266(4), c = 15.6777(7) Å, V = 1193.91(12) Å3, Z = 8. Its crystal structure was refined from single-crystal X-ray diffraction data to R1 = 0.0134 on the basis of 555 unique reflections with Fo > 4σ(Fo) and 34 refined parameters. The crystal structure shows columns of corner-sharing [Ti/(V,Fe)]-centered octahedra running along c, connected along a and b through (As2O5) dimers. A {001} layer of Ba-centered [10+2]-coordinated polyhedra is intercalated between (As2O5) dimers. Bianchiniite has structural relations with fresnoite and melilite group minerals. The name honours the two mineral collectors Andrea Bianchini (b. 1959) and Mario Bianchini (b. 1962) for their contribution to the knowledge of the mineralogy of pyrite ± baryte ± iron oxide ore deposits from the Apuan Alps.
Marco E. Ciriotti

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bortolozzi giorgio
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Re: IMA 2019-022 = bianchiniite

Messaggio da bortolozzi giorgio » lun 22 mar, 2021 14:39

Ho corretto il nome. :)

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Marco E. Ciriotti
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Re: IMA 2019-022 = bianchiniite

Messaggio da Marco E. Ciriotti » lun 22 mar, 2021 14:46

Grazie Giorgio. Perfetto. Lo stavo facendo.
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2019-022 = bianchiniite

Messaggio da Marco E. Ciriotti » mar 23 mar, 2021 7:48

Questa nuova specie del Monte Arsiccio è veramente molto interessante!
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2019-022 = bianchiniite

Messaggio da Marco E. Ciriotti » mer 28 lug, 2021 12:34

Pubblicazione effettuata.

Referenza:
▪ Biagioni, C., Pasero, M., Hålenius, U., Bosi, F. (2021): Bianchiniite, Ba2(Ti4+V3+)(As2O5)2OF, a new diarsenite mineral from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy). Mineralogical Magazine, 85, 354-363.
Marco E. Ciriotti

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