| Reference Type | Journal (article/letter/editorial) |
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| Title | Vigezzite, (Ca, Ce) (Nb, Ta,Ti)2O6, a new aeschynite-type mineral from the Alps |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Graeser, S. | Author |
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| Schwander, H. | Author |
| Hänni, H. | Author |
| Mattioli, V. | Author |
| Year | 1979 (December) | Volume | 43 |
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| Issue | 328 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_43/43-328-459.pdf+ |
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| DOI | doi:10.1180/minmag.1979.043.328.02Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 3065 | Long-form Identifier | mindat:1:5:3065:0 |
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| GUID | 0 |
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| Full Reference | Graeser, S., Schwander, H., Hänni, H., Mattioli, V. (1979) Vigezzite, (Ca, Ce) (Nb, Ta,Ti)2O6, a new aeschynite-type mineral from the Alps. Mineralogical Magazine, 43 (328) 459-462 doi:10.1180/minmag.1979.043.328.02 |
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| Plain Text | Graeser, S., Schwander, H., Hänni, H., Mattioli, V. (1979) Vigezzite, (Ca, Ce) (Nb, Ta,Ti)2O6, a new aeschynite-type mineral from the Alps. Mineralogical Magazine, 43 (328) 459-462 doi:10.1180/minmag.1979.043.328.02 |
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| In | (1979, December) Mineralogical Magazine Vol. 43 (328) Mineralogical Society |
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| Abstract/Notes | A new mineral species, vigezzite (Ca,Ce) (Nb,Ta,Ti)2O6, was found near Orcesco, Valle Vigezzo, Prov. Novara, Northern Italy. It forms fiat prismatic crystals up to 2–3 mm length of an orange-yellow colour. The crystals are elongated along the a-axis and flattened on (010). Cleavage at right angles to the prism axis is distinct, fracture conchoidal. Vickers hardness VHN = 396 kp/mm2, corresponding to -5 in the Mohs scale. Refraction indices are high: α = 2.14, γ = 2.315 (NaD, 589 µm), birefringence is 0.175. Optic angle 2Vγ is large. Though intensively yellow coloured, the mineral shows no pleochroism. α = c, β = b, γ = a; optic axial plane is parallel to (010).Vigezzite is orthorhombie with space group Pmnb or P21nb; a = 7.559±0.01, b = 11.028±0.01, c = 5.360± 0.004 Å, Z = 4. The six strongest lines of the X-ray powder pattern are 4.821 (9) (011), 3.784 (8) (200), 3.036 (10) (031), 2.974 (10) (211), 1.7129 (6) (242), 1.6018 (7) (431).Electron microprobe analyses lead to the empirical formula (Ca0.82Ce0.24)Σ1.06(Nb0.9Ta0.62Ti0.5)Σ2.02O6. The mineral is not completely homogenous, the ratio Nb/(Nb+Ta) varies from 0.55–0.62. Rynersonite Ca (Ta,Nb)2O6, may represent the Ta-dominant equivalent of vigezzite. Vigezzite occurs together with several other Nb-minerals such as pyrochlore, columbite and fersmite, whose crystallographical and chemical data are reported, in an albitic rock of presumably pegmatitic origin. |
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