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Albertiniite, Fe2+(SO3)·3H2O, a new sulfite mineral species from the Monte Falò Pb-Zn mine, Coiromonte, Armeno Municipality, Verbano Cusio Ossola Province, Piedmont, Italy

Published online by Cambridge University Press:  02 January 2018

P. Vignola ,
G. D. Gatta ,
N. Rotiroti ,
P. Gentile ,
F. Hatert ,
M. Baijot ,
D. Bersani ,
A. Risplendente  and
A. Pavese
P. Vignola*
Affiliation:
CNR-Istituto per la Dinamica dei Processi Ambientali, via Botticelli 23, I-20133, Milano, Italy Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, via Botticelli 23, I-20133 Milano, Italy
G. D. Gatta
Affiliation:
Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, via Botticelli 23, I-20133 Milano, Italy
N. Rotiroti
Affiliation:
Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, via Botticelli 23, I-20133 Milano, Italy
P. Gentile
Affiliation:
Dipartimento di Scienze dell’Ambiente e del Territorio e di Scienze della Terra, UniversitàMilano-Bicocca, Piazzale della Scienza 4-building U4, I-20126 Milano, Italy
F. Hatert
Affiliation:
Laboratoire de Minéralogie, Département de Géologie, Université de Liège, Bâtiment B18, Sart Tilman, B-4000 Liège, Belgium
M. Baijot
Affiliation:
Laboratoire de Minéralogie, Département de Géologie, Université de Liège, Bâtiment B18, Sart Tilman, B-4000 Liège, Belgium
D. Bersani
Affiliation:
Dipartimento di Fisica e Scienze della Terra, Università di Parma, Viale G.P. Usberti 7/a, I-43124 Parma, Italy
A. Risplendente
Affiliation:
Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, via Botticelli 23, I-20133 Milano, Italy
A. Pavese
Affiliation:
Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, via Botticelli 23, I-20133 Milano, Italy
*
*E-mail: pietro.vignola@idpa.cnr.it
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Abstract

Albertiniite, Fe2+(SO3)·3H2O, is a new Fe2+ sulfite trihydrate, related chemically to gravegliaite. It occurs at the Monte Falò Pb-Zn mine near Coiromonte, in the Armeno Municipality, Verbano–Cusio–Ossola Province, Italy. It is an intermediate product of oxidation between iron sulfides and sulfates, forming monoclinic, colourless to pale yellow, transparent crystals with a vitreous lustre. The mineral occurs associated with stolzite, pyromorphite, hinsdalite, plumbogummite, gibbsite, scheelite and jarosite on brittle fractures of quartz veins or chlorite-schist. Albertiniite is optically biaxial (+) with 2V(meas) ≈ 40° and 2V(calc) = 66°. The measured refractive indices, using sodium light (589 nm) are: α = 1.612(2)°, β = 1.618(2)° and γ = 1.632(2)°. The optical axis plane is parallel to the perfect {010} cleavage plane. It is non-fluorescent under shortwave (254 nm) or longwave (366 nm) ultraviolet light. The calculated density is 2.469 g cm–3 (from the crystal-structure refinement), or 2.458 g cm–3 (from the chemical analysis and the single-crystal unit-cell parameters). The empirical formula is (average of 16 spots and based on 3 anhydrous oxygen apfu) (Ca0.001Mg0.001Na0.003)∑1.061(S0.971O3)·2.84H2O, with the H2O content calculated by difference to 100 wt.%. Albertiniite is monoclinic, with space group P21/n. Its unit-cell parameters are: a = 6.633(1), b = 8.831(1), c = 8.773(1) Å, β = 96.106(8)° and V = 511.0(1) Å3, with Z = 4. The eight strongest measured lines in the powder X-ray diffraction pattern are [d in Å, (I/I0), (hkl)]: 4.072 (100) (1̄11), 3.539 (93) (1̄12), 5.533 (27) (1̄01), 6.167 (14) (011), 2.830 (14) (211), 4.998 (14) (101), 4.353 (12) (111) and 3.897 (12) (012). The mineral, which has been approved by the CNMNC, number IMA2015-004, is named albertiniite in honour of Claudio Albertini, an Italian mineral collector and expert in the systematic mineralogy of the Alps and pegmatites.

Keywords

albertiniiteFe sulfite trihydrateMonte Falò Pb-Zn mineVerbania provinceItalynew mineral
Type
Research Article
Information
Mineralogical Magazine , Volume 80 , Issue 6 , October 2016 , pp. 985 - 994
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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