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PLUMBOPHARMACOSIDERITE, Pb 0.5Fe3þ 4(AsO4)3(OH)4/C1 5H2O, A NEW MINERAL SPECIES FROM THE MONTE FAL`O Pb-Zn MINE NEAR THE VILLAGE OF COIROMONTE IN THE ARMENO MUNICIPALITY, NOVARA PROVINCE, ITALY

PIETRO VIGNOLA, NICOLA ROTIROTI

2018enmineralogymineralplumbopharmacosideritegeology

Abstract

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Plumbopharmacosiderite, Pb0.5Fe3þ4(AsO4)3(OH)4/C1 5H2O, is a new hydrated and hydroxylated arsenate of Fe3þ and Pb belonging to the pharmacosiderite group, pharmacosiderite supergroup of minerals. It was found at the Monte Fal`o 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)R0.81(Fe3þ3.69Al0.22)R3.91(As2.95Si0.01)R2.96O12(OH)R3.90/C1 5H2O.

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@article{4a11bced-5b5d-4b20-8144-77d454cd88d1,
  title={PLUMBOPHARMACOSIDERITE, Pb 0.5Fe3þ 4(AsO4)3(OH)4/C1 5H2O, A NEW MINERAL SPECIES FROM THE MONTE FAL`O Pb-Zn MINE NEAR THE VILLAGE OF COIROMONTE IN THE ARMENO MUNICIPALITY, NOVARA PROVINCE, ITALY},
  author={PIETRO VIGNOLA and NICOLA ROTIROTI},
  year={2018},
  language={en}
}
TY  - JOUR
TI  - PLUMBOPHARMACOSIDERITE, Pb 0.5Fe3þ 4(AsO4)3(OH)4/C1 5H2O, A NEW MINERAL SPECIES FROM THE MONTE FAL`O Pb-Zn MINE NEAR THE VILLAGE OF COIROMONTE IN THE ARMENO MUNICIPALITY, NOVARA PROVINCE, ITALY
AU  - PIETRO VIGNOLA
AU  - NICOLA ROTIROTI
PY  - 2018
LA  - en
ER  -

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