IMA 2017-016 = piccoliite

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Marco E. Ciriotti
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IMA 2017-016 = piccoliite

Messaggio da Marco E. Ciriotti » ven 21 ott, 2022 10:36

In risposta a specifica richiesta: il lavoro è pronto. A breve ci sarà la pubblicazione.
Marco E. Ciriotti

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Re: IMA 2017-016 = piccoliite

Messaggio da Marco E. Ciriotti » ven 11 nov, 2022 14:06

Prossima pubblicazione.

Referenza:
▪ Cámara, F., Biagioni. C., Ciriotti, M.E., Bosi, F., Kolitsch, U., Paar, W.H., Hålenius, U., Lepore, G.O., Blass, G., Bittarello, E. (2023): Piccoliite, NaCaMn3+2(AsO4)2O(OH), a new arsenate from the manganese deposits of Montaldo di Mondovì and Valletta, Piedmont (Italy). Mineralogical Magazine, 87, (in press).

Abstract:
Piccoliite, ideally NaCaMn3+2(AsO4)2O(OH), is a new mineral discovered in the Fe–Mn ore hosted in metaquartzites of the Montaldo di Mondovì mine, Corsaglia Valley, Cuneo Province, Piedmont, Italy. It occurs as small and rare black crystals and aggregates hosted by a matrix of quartz, associated with calcite and berzeliite/manganberzeliite. It has been also found in the Valletta mine near (Canosio, Maira Valley, Cuneo Province, Piedmont, Italy), where it occurs embedded in quartz associated to grandaite, hematite, tilasite/adelite and rarely thorianite. The mineral is opaque (thin splinters may be very dark red), with brown streak and has a resinous to vitreous lustre. It is brittle with irregular fracture. No cleavage has been observed. Measured Mohs hardness is ∼5–5.5. Calculated density is 4.08 g⋅cm–3. Piccoliite is non-fluorescent. Chemical spot analyses by WDS-EPMA resulted in the empirical formula (based on 10 anions pfu) (Na0.64Ca0.35)Σ0.99(Ca0.75Na0.24)Σ0.99(Mn3+1.08Fe3+0.59Mg0.20Ca0.10)Σ1.97(As2.03V0.03Si0.01)Σ2.07O9(OH). The mineral is orthorhombic, Pbcm, with single-crystal unit-cell parameters a = 8.8761(9), b = 7.5190(8), c = 11.689(1) Å and V = 780.1(1) Å3, with Z = 4. The seven strongest X-ray powder diffraction lines are [d Å (Irel; hkl)]: 4.85 (57; 102), 3.470 (59; 120,113), 3.167 (100; 022), 2.742 (30; 310,213), 2.683 (53; 311, 023), 2.580 (50; 222, 114) and 2.325 (19; 320, 214, 223). The crystal structure (R1 = 0.0193 for 1554 unique reflections) has MnO5(OH) octahedra forming edge-shared dimers; these dimers are connected through corner-sharing, forming two-up-two-down [[6]M2([4]TO4)4φ2] chains [M = Mn; T = As; φ = O(OH)] running along [001]. These chains are bonded in the a and b directions by sharing corners with AsO4 tetrahedra, giving rise to a framework of tetrahedra and octahedra hosting seven-coordinated Ca2+ and Na+ cations. The crystal structure of piccoliite is closely related to that of pilawite-(Y), ideally CaYAl2(SiO4)2O(OH), as well as to carminite-group minerals that also show the same type of chains but with different linkage. The mineral is named after the mineral collectors Gian Paolo and Gian Carlo Piccoli (father and son) (1926-1996 and b. 1953, respectively), the latter having discovered the type material at the Montaldo di Mondovì mine.
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2017-016 = piccoliite

Messaggio da Marco E. Ciriotti » lun 28 nov, 2022 11:22

Per uso strettamente personale, chi è interessato all'articolo può richiederlo a: marco.ciriotti45@gmail.com
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
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Re: IMA 2017-016 = piccoliite

Messaggio da Marco E. Ciriotti » mer 22 feb, 2023 10:30

La pubblicazione sul Mineralogical Magazine è ora open: https://www.cambridge.org/core/journals ... 4BF7DB9E56
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
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Re: IMA 2017-016 = piccoliite

Messaggio da Marco E. Ciriotti » mar 16 mag, 2023 14:37

Pubblicazione avvenuta:

Referenza:
▪ Cámara, F., Biagioni. C., Ciriotti, M.E., Bosi, F., Kolitsch, U., Paar, W.H., Hålenius, U., Lepore, G.O., Blass, G., Bittarello, E. (2023): Piccoliite, NaCaMn3+2(AsO4)2O(OH), a new arsenate from the manganese deposits of Montaldo di Mondovì and Valletta, Piedmont (Italy). Mineralogical Magazine, 87, 204–217.
Marco E. Ciriotti

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