http://www.cnr.it/ontology/cnr/individuo/prodotto/ID203175

Bassoite, SrV3O7.4H2O, a new mineral from Molinello mine, Val Graveglia, eastern Liguria, Italy. (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Bassoite, SrV3O7.4H2O, a new mineral from Molinello mine, Val Graveglia, eastern Liguria, Italy. (Articolo in rivista) (literal)

Anno

2011-01-01T00:00:00+01:00 (literal)

Alternative label

Bindi, L. (1,2); Carbone, C. (3); Lucchetti, G. (3); Cabella, R. (3) (2011)
Bassoite, SrV3O7.4H2O, a new mineral from Molinello mine, Val Graveglia, eastern Liguria, Italy.
in Mineralogical magazine (Online); Mineralogical Society of Great Britain and Ireland, LONDON (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Bindi, L. (1,2); Carbone, C. (3); Lucchetti, G. (3); Cabella, R. (3) (literal)

Pagina inizio

2677 (literal)

Pagina fine

2686 (literal)

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ID_PUMA: /cnr.igg/2011-A0-042.Area di valutazione 04 - Scienze della Terra (literal)

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http://minmag.geoscienceworld.org/ (literal)

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75 (literal)

Rivista

Mineralogical magazine (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

5 (literal)

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(1) Museo di Storia Naturale, Sezione Mineralogia e Litologia, Universita degli Studi di Firenze (2) CNR-Istituto di Geoscienze e Georisorse, Sezione di Firenze (3) Dipartimento per lo Studio del Territorio e delle sue Risorse, Universita di Genova (literal)

Titolo

Bassoite, SrV3O7.4H2O, a new mineral from Molinello mine, Val Graveglia, eastern Liguria, Italy. (literal)

Abstract

Bassoite, ideally SrV3O7·4H2O, is a new mineral from the Molinello manganese mine, Val Graveglia, eastern Liguria, northern Apennines, Italy. It occurs as black euhedral to subhedral grains up to 400 ?m across, closely associated with rhodonite, quartz and braunite. Bassoite is opaque with a sub-metallic lustre and a black streak. It is brittle and neither fracture nor cleavage was observed; the Vickers micro-hardness (VHN100) is 150 kg/mm2 (range 142-165; corresponding to a Mohs hardness of 4-4½). The calculated density is 2.940 g/cm3 (on the basis of the empirical formula and X-ray single-crystal data). Bassoite is weakly bireflectant and very weakly pleochroic from grey to a dark green. Internal reflections are absent. The mineral is anisotropic, without characteristic rotation tints. Reflectance percentages (Rmin and Rmax) for the four standard COM wavelengths are 18.5%, 19.0% (471.1 nm); 17.2%, 17.8% (548.3 nm); 16.8%, 17.5% (586.6 nm) and 16.2%, 16.8% (652.3 nm), respectively. Bassoite is monoclinic, space group P21/m, with unit-cell parameters: a = 5.313(3) Å, b = 10.495(3) Å, c = 8.568(4) Å, ? = 91.14(5)°, V = 477.7(4) Å3, a:b:c = 0.506:1:0.816, and Z = 2. The crystal structure was refined to R1 = 0.0209 for 1148 reflections with Fo > 4?(Fo) and it consists of layers of VO5 pyramids (with vanadium in the tetravalent state) pointing up and down alternately with Sr between the layers (in nine-fold coordination). The nine most intense X-ray powder-diffraction lines [d in Å (I/I0) (hkl)] are: 8.5663 (100) (001); 6.6363 (14) (011); 3.4399 (14) (21); 3.4049 (17) (121); 2.8339 (15) (22); 2.7949 (11) (122); 2.6550 (15) (200); 2.6237 (11) (040) and 1.8666 (15) (240). Electron microprobe analyses produce a chemical formula (Sr0.97Ca0.02Na0.01)V3.00O7·4H2O, on the basis of ?(Sr+Ca+Na) = 1, taking the results of the structure refinement into account. The presence of water molecules was confirmed by micro-Raman spectroscopy. The name honours Riccardo Basso (b. 1947), full professor of Mineralogy and Crystallography at the University of Genova. The new mineral and mineral name have been approved by the Commission on New Minerals, Nomenclature and Classification, IMA (2011-028). (literal)

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