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Armellinoite-(Ce), Ca4Ce4+(AsO4)4⋅H2O, a new mineral species isostructural with pottsite, (Pb3Bi)Bi(VO4)4⋅H2O

Published online by Cambridge University Press:  13 December 2021

Fernando Cámara Open the ORCID record for Fernando Cámara [Opens in a new window] ,
Marco E. Ciriotti Open the ORCID record for Marco E. Ciriotti [Opens in a new window] ,
Uwe Kolitsch Open the ORCID record for Uwe Kolitsch [Opens in a new window] ,
Ferdinando Bosi Open the ORCID record for Ferdinando Bosi [Opens in a new window] ,
Erica Bittarello Open the ORCID record for Erica Bittarello [Opens in a new window] ,
Piero Brizio ,
Pietro Vignola Open the ORCID record for Pietro Vignola [Opens in a new window]  and
Günter Blaß
Fernando Cámara*
Affiliation:
Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, via Luigi Mangiagalli 34, I-20133Milano, Italy
Marco E. Ciriotti
Affiliation:
Associazione Micromineralogica Italiana, via San Pietro 55, I-10073 Devesi-Cirié, Torino, Italy Dipartimento di Scienze della Terra, Università degli Studi di Torino, via Tommaso Valperga Caluso 35, I-10125Torino, Italy
Uwe Kolitsch
Affiliation:
Mineralogisch-Petrographische Abt., Naturhistorisches Museum, Burgring 7, A-1010Wien, Austria Institut für Mineralogie und Kristallographie, Universität Wien, Althanstraße 14, A-1090Wien, Austria
Ferdinando Bosi
Affiliation:
Dipartimento di Scienze della Terra, Università Sapienza, piazzale Aldo Moro 5, I-00185Roma, Italy CNR – Istituto di Geoscienze e Georisorse, UOS Roma, I-00185, Rome, Italy
Erica Bittarello
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Torino, via Tommaso Valperga Caluso 35, I-10125Torino, Italy SpectraLab s.r.l., Academic spin-off of the University of Turin, via Valperga Caluso 35, I-10125Torino, Italy
Piero Brizio
Affiliation:
Associazione Micromineralogica Italiana, via Guido Reni 218 C, I-10137Torino, Italy
Pietro Vignola
Affiliation:
CNR-Istituto di Geologia Ambientale e Geoingegneria, via Mario Bianco 9, I-20131, Milano, Italy
Günter Blaß
Affiliation:
Merzbachstraße 6, D-52249Eschweiler, Germany
*
*Author for correspondence: Fernando Cámara, Email:fernando.camara@unimi.it
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Abstract

Armellinoite-(Ce), ideally Ca4Ce4+(AsO4)4⋅H2O, is a new mineral discovered in Fe–Mn ore in metaquartzites of the Montaldo mine, Corsaglia Valley, Cuneo Province, Piedmont, Italy. It occurs as very small and rare, pale yellow to brown–yellow pseudo-octahedral translucent crystals hosted by a matrix of quartz, hematite, cryptomelane/hollandite, tilasite, muscovite, braunite and montmorillonite. The mineral is translucent, with white streak and has a resinous to vitreous lustre. It is brittle with irregular fracture and fair cleavage parallel to {110} and {100}. Estimated Mohs hardness is ~3–3.5. Calculated density is 4.29 g⋅cm–3. Armellinote-(Ce) is uniaxial (–), ω = 1.795(5), ɛ = 1.765(5) (white light), non-pleochroic and non-fluorescent. Chemical point analyses by WDS-EPMA yielded the empirical formula (based on 17 O+F anions): A(Ca3.89Th0.08Sr0.02La0.03)Σ4.02B(Ce4+0.76Nd0.13Y0.08Gd0.03Sm0.02Pr0.01Dy0.01Ho0.01)Σ1.05[(As4.00P0.01)Σ4.01O4]4⋅(H2O0.85F0.15)Σ2.00. The presence of H2O was confirmed by Raman spectroscopy. The mineral is tetragonal, I41/a, with single-crystal unit-cell parameters a = 10.749(2), c = 12.030(2) Å and V = 1390.0(6) Å3, with Z = 4. The eight strongest X-ray powder diffraction lines are [d Å (Irel; hkl)]: 7.983 (36; 101), 4.443 (23; 2̄11), 2.957 (100; 3̄12), 2.398 (14; 420), 1.875 (22; 424, 325), 1.728 (19; 3̄16), 1.612 (13; 613) and 1.475 (26; 712, 552). The crystal structure (R1 = 0.0284 for 1275 unique reflections) has isolated TO4 (T = As5+) tetrahedra that link Ca2+- or Ce4+-centred polyhedra via common oxygen ligands to form 2D blocks or double-layered (DL) structural units parallel to (001). Armellinoite-(Ce) is isostructural with pottsite, ideally (Pb3Bi)Bi(VO4)4⋅H2O, and closely related to a larger number of anhydrous synthetic compounds. The mineral is named after the mineral collector Gianluca Armellino (b. 1962), who collected the discovery sample.

Keywords

armellinoite-(Ce)new-mineralCe4+ hydrous arsenatecrystal structureRamanMontaldo mineCuneoPiedmontItaly
Type
Article
Information
Mineralogical Magazine , Volume 85 , Issue 6 , December 2021 , pp. 901 - 909
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Anthony R Kampf

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