IMA 2016-109 = plumbopharmacosiderite

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Marco E. Ciriotti
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IMA 2016-109 = plumbopharmacosiderite

Messaggio da Marco E. Ciriotti » mer 25 apr, 2018 11:14

Prossima pubblicazione.

Referenza:
▪ Vignola, P., Rotiroti, N., Hatert, F., Dal Bo, F., Gentile, P., Albertini, C., Merlini, M., Risplendente, A., Pavese, A. (2018): Plumbopharmacosiderite, Pb0.5Fe3+4(AsO4)3(OH)4·5H2O, a new mineral species from the Monte Falò Pb-Zn mine near the village of Coiromonte in the Armeno municipality, Novara province, Italy. Canadian Mineralogist, 56, (in press).

Abstract:
Plumbopharmacosiderite, Pb0.5Fe3+4(AsO4)3(OH)4·5H2O, is a new hydrated and hydroxylated arsenate of Fe3+ and Pb belonging to the pharmacosiderite group, pharmacosiderite supergroup of minerals. It was found at the Monte Falò Pb-Zn mine near the village of Coiromonte in the Armeno municipality, Novara province, Italy. The mineral occurs on the surfaces of brittle fissures in a mica schist cross-cut by arsenopyrite veins as minute cubes up to 50 μm in size. Plumbopharmacosiderite is a product of oxidation of primary Pb-, Fe-sulfide minerals due to weathering of the primary ore and is found in close association with arsenopyrite, scorodite, beudantite, rare segnitite, marcasite, galena, sphalerite, and mimetite. Its color is pale green to yellowish-green, transparent with a vitreous to resinous luster. The streak is white. Plumbopharmacosiderite is brittle with an irregular fracture. The Mohs hardness is 2.5–3 and the calculated density is 2.89 g/cm3. The mineral is optically isotropic with refractive index n = 1.73(1). Plumbopharmacosiderite is non-fluorescent under 254 nm (short wave) and 366 nm (long wave) UV light. The empirical formula is: (Pb0.42K0.20Ba0.15Na0.03Ca0.01)Σ0.81(Fe3+3.69Al0.22)Σ3.91(As2.95Si0.01)Σ2.96O12(OH)Σ3.90·5H2O. The simplified formula is Pb0.5Fe3+4(AsO4)3(OH)4·5H2O. Plumbopharmacosiderite is cubic, with space group P-43m and unit-cell parameters a 7.9791 (2) Å and V 508.00(6) Å3 for Z = 1. Its crystal structure was refined and conforms with that of bariopharmacosiderite. The new mineral and the name plumbopharmacosiderite were approved by the Commission on New Minerals, Nomenclature, and Classification (CNMNC) of the International Mineralogical Association (IMA) under the number IMA 2016-109.
Marco E. Ciriotti

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Marco E. Ciriotti
Messaggi: 24159
Iscritto il: ven 25 giu, 2004 11:31
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Re: IMA 2016-109 = plumbopharmacosiderite

Messaggio da Marco E. Ciriotti » lun 21 mag, 2018 22:30

Pubblicazione effettuata.

Referenza:
▪ Vignola, P., Rotiroti, N., Hatert, F., Dal Bo, F., Gentile, P., Albertini, C., Merlini, M., Risplendente, A., Pavese, A. (2018): Plumbopharmacosiderite, Pb0.5Fe3+4(AsO4)3(OH)4·5H2O, a new mineral species from the Monte Falò Pb-Zn mine near the village of Coiromonte in the Armeno municipality, Novara province, Italy. Canadian Mineralogist, 56, 143-150.
Marco E. Ciriotti

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TOSATO FABIO
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Re: IMA 2016-109 = plumbopharmacosiderite

Messaggio da TOSATO FABIO » mar 22 mag, 2018 6:36

Complimenti a tutti!
Tosato Fabio
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