IMA 2016-072 = alpeite

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Marco E. Ciriotti
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IMA 2016-072 = alpeite

Messaggio da Marco E. Ciriotti » lun 20 mar, 2017 10:18

Prossima pubblicazione.

Referenza:
▪ Kampf, A.R., Carbone, C., Belmonte, D., Nash, B.P., Chiappino, L., Castellaro, F. (2017): Alpeite, Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6, a new ardennite-group mineral from Italy. European Journal of Mineralogy, 29, (in press).
Marco E. Ciriotti

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TOSATO FABIO
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Re: IMA 2016-072 = alpeite

Messaggio da TOSATO FABIO » lun 20 mar, 2017 19:54

Complimentoni a tutti!
Tosato Fabio
"Il vero viaggio di scoperta non consiste nel cercare nuove terre, ma nell'avere nuovi occhi." M. Proust
Noi siamo anche quello che non siamo riusciti ad essere.
Sic transit gloria mundi.

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Marco E. Ciriotti
Messaggi: 23560
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Re: IMA 2016-072 = alpeite

Messaggio da Marco E. Ciriotti » gio 06 apr, 2017 10:05

Prossima pubblicazione.

Referenza:
▪ Kampf, A.R., Carbone, C., Belmonte, D., Nash, B.P., Chiappino, L., Castellaro, F. (2017): Alpeite, CaM4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6, a new ardennite-group mineral from Italy. European Journal of Mineralogy, 29, (in press).

Abstract:
Alpeite (IMA2016-072), CaM4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6, is a new member of the ardennite group from the Monte Alpe mine, Liguria, Italy. It crystallized from V- and Mn-rich hydrothermal fluids in an oxidizing environment. Alpeite occurs as intergrowths of plates, flattened on {1 0 0} and exhibiting the forms {1 0 0}, {0 0 1}, {0 1 2} and {1 0 2}. The mineral is brownish red and transparent with a vitreous to silky lustre and beige streak. Crystals are brittle with a curved and stepped fracture, and a perfect cleavage on {1 0 0} and good cleavages on {0 1 0 and {0 0 1}. The Mohs' hardness is 5½ to 6. The calculated density is 3.374 g cm-3. The mineral is inert in concentrated HCl at room temperature. Optically, alpeite crystals are biaxial (-), with α = 1.747(3), β = 1.785(3) and γ = 1.808(3) (white light); 2V = 73(2); dispersion r>v, strong; the optical orientation X = a, Y = b, Z = c. Pleochroism is Y>Z>X in shades of reddish brown. Electron microprobe analyses gave the empirical formula (Ca3.84Mn2+0.16)Σ4.00(Mn3+1.33Al0.67)Σ2.00(Al1.29Mn3+0.60V5+0.10)Σ1.99(Mn3+0.70Mg0.65Al0.42Co2+0.20)Σ1.97(SiO4)2(Si3O10)[(V5+0.75Si0.25)O4](OH)6, based on 28O atoms per formula unit. Alpeite is orthorhombic, Pnmm, with the unit-cell parameters: a = 8.9421(11), b = 6.0534 (6), c = 18.9781(18)Å, V = 1027.29(19)Å3 and Z = 2. The four strongest lines in the X-ray powder diffraction pattern are [dobs/Å (I) (hkl)]: 3.022 (93) (1 1 5), 2.673 (100) (1 1 6), 2.572 (69) (2 0 6) and 1.5112 (83) (0 4 0,4 2 7). The crystal structure was refined to R1=0.044 for 834 observed reflections [Fo>>4σF]. The structure is the same as that of other members of the ardennite group. It contains chains of edge-sharing Mn3+ and Al octahedra extending along the b axis, which are linked into a framework by sharing corners with SiO4 tetrahedra and with Si3O10 tetrahedral groups. Within the cavities in this framework are 7-coordinated Ca sites. In the structure of alpeite, Mn3+ is the dominant cation in the M1 site and is the dominant trivalent cation in the M3 site, while in all other members of the ardennite group [ardennite-(As), ardennite-(V) and kannanite], Al is the dominant cation in the M1 site and is the dominant trivalent cation in the M3 site.
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2016-072 = alpeite

Messaggio da Marco E. Ciriotti » mer 13 dic, 2017 8:58

Pubblicazione avvenuta.

Referenza:
▪ Kampf, A.R., Carbone, C., Belmonte, D., Nash, B.P., Chiappino, L., Castellaro, F. (2017): Alpeite, CaM4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6, a new ardennite-group mineral from Italy. European Journal of Mineralogy, 29, 907-914.

Abstract:
Alpeite (IMA2016-072), CaM4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6, is a new member of the ardennite group from the Monte Alpe mine, Liguria, Italy. It crystallized from V- and Mn-rich hydrothermal fluids in an oxidizing environment. Alpeite occurs as intergrowths of plates, flattened on {1 0 0} and exhibiting the forms {1 0 0}, {0 0 1}, {0 1 2} and {1 0 2}. The mineral is brownish red and transparent with a vitreous to silky lustre and beige streak. Crystals are brittle with a curved and stepped fracture, and a perfect cleavage on {1 0 0} and good cleavages on {0 1 0 and {0 0 1}. The Mohs' hardness is 5½ to 6. The calculated density is 3.374 g cm-3. The mineral is inert in concentrated HCl at room temperature. Optically, alpeite crystals are biaxial (-), with α = 1.747(3), β = 1.785(3) and γ = 1.808(3) (white light); 2V = 73(2); dispersion r>v, strong; the optical orientation X = a, Y = b, Z = c. Pleochroism is Y>Z>X in shades of reddish brown. Electron microprobe analyses gave the empirical formula (Ca3.84Mn2+0.16)Σ4.00(Mn3+1.33Al0.67)Σ2.00(Al1.29Mn3+0.60V5+0.10)Σ1.99(Mn3+0.70Mg0.65Al0.42Co2+0.20)Σ1.97(SiO4)2(Si3O10)[(V5+0.75Si0.25)O4](OH)6, based on 28O atoms per formula unit. Alpeite is orthorhombic, Pnmm, with the unit-cell parameters: a = 8.9421(11), b = 6.0534 (6), c = 18.9781(18)Å, V = 1027.29(19)Å3 and Z = 2. The four strongest lines in the X-ray powder diffraction pattern are [dobs/Å (I) (hkl)]: 3.022 (93) (1 1 5), 2.673 (100) (1 1 6), 2.572 (69) (2 0 6) and 1.5112 (83) (0 4 0,4 2 7). The crystal structure was refined to R1=0.044 for 834 observed reflections [Fo>>4σF]. The structure is the same as that of other members of the ardennite group. It contains chains of edge-sharing Mn3+ and Al octahedra extending along the b axis, which are linked into a framework by sharing corners with SiO4 tetrahedra and with Si3O10 tetrahedral groups. Within the cavities in this framework are 7-coordinated Ca sites. In the structure of alpeite, Mn3+ is the dominant cation in the M1 site and is the dominant trivalent cation in the M3 site, while in all other members of the ardennite group [ardennite-(As), ardennite-(V) and kannanite], Al is the dominant cation in the M1 site and is the dominant trivalent cation in the M3 site.
Marco E. Ciriotti

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Antonio Borrelli
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Re: IMA 2016-072 = alpeite

Messaggio da Antonio Borrelli » mer 13 dic, 2017 18:42

Ciao Marco è possibile averne una copia?
Antonio

"La vera saggezza sta in colui che sa di non sapere" - Socrate

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Marco E. Ciriotti
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Re: IMA 2016-072 = alpeite

Messaggio da Marco E. Ciriotti » mer 13 dic, 2017 18:48

Al momento gli articoli non sono ancora scaricabili, ma penso che domani lo saranno.
Comunque non appena downloadable ti passo il PDF.
Marco E. Ciriotti

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Antonio Borrelli
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Re: IMA 2016-072 = alpeite

Messaggio da Antonio Borrelli » mer 13 dic, 2017 19:26

Grazie.
Antonio

"La vera saggezza sta in colui che sa di non sapere" - Socrate

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Marco E. Ciriotti
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Re: IMA 2016-072 = alpeite

Messaggio da Marco E. Ciriotti » ven 15 dic, 2017 16:14

Mentre tutti gli altri articoli sono ora regolarmente apparsi sulle pagine dell'editore Schweizerbart, quello sull'alpeite è stato distrattamente dimenticato e pertanto non è stato possibile effettuare il download.
Ho segnalato l'errore e anche chiesto il PDF. Vediamo...
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2016-072 = alpeite

Messaggio da Marco E. Ciriotti » sab 16 dic, 2017 16:33

Grazie a Donato che mi ha fatto avere il PDF, ora è disponibile e già passato ad Antonio.
Marco E. Ciriotti

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Antonio Borrelli
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Re: IMA 2016-072 = alpeite

Messaggio da Antonio Borrelli » sab 16 dic, 2017 16:48

Ri-grazie!
Antonio

"La vera saggezza sta in colui che sa di non sapere" - Socrate

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