IMA 2013-133 = bernarlottiite

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Marco E. Ciriotti
Messaggi: 23547
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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IMA 2013-133 = bernarlottiite

Messaggio da Marco E. Ciriotti » sab 04 feb, 2017 7:19

Prossima pubblicazione.

Referenza:
▪ Orlandi, P., Biagioni, C., Bonaccorsi, E., Moëlo, Y., Paar, W.H. (2017): Lead-antimony sulphosalts from Tuscany (Italy). XXI. Bernarlottiite, Pb12(As10Sb6)16S36, a new N = 3.5 member of the sartorite homologous series from the Ceragiola marble quarry: occurrence and crystal structure. European Journal of Mineralogy, 29, (in press).

Abstract:
The new mineral species bernarlottiite, Pb12(As10Sb6)&ASigma;16S36, has been discovered in cavities of the Early Jurassic marbles from the Ceragiola quarry, Seravezza, Apuan Alps, Tuscany, Italy. Its name honours Bernardino Lotti (1847–1933) for his significant contribution to the knowledge of the geology of Tuscany and to the development of the Tuscan mining industry. It occurs as lead-grey acicular crystals up to 1mm in length and few μm in width, with a metallic lustre, associated with Sb-rich sartorite. Under the ore microscope, bernarlottiite is white with abundant red internal reflections; pleochroism is weak in air, with shades of grey-blue. Anisotropism is distinct to strong, with greyish-bluish rotation tints. Reflectance percentages for the four COM wavelengths are [Rmin, Rmax (%), (λ)]: 30.0, 37.5 (470 nm); 30.3, 37.3 (546 nm); 29.7, 36.8 (589 nm); and 29.3, 36.2 (650 nm). Electron-microprobe analyses, collected on two different grains, gave (in wt%): Cu 0.09 (16), Pb 48.89 (1.26), As 17.48 (22), Sb 11.36 (10), S 23.11 (32), total 100.93 (1.38) (sample # 2987) and Pb 47.43 (26), As 14.56 (24), Sb 13.92 (18), S 22.64 (17), total 98.56 (44) (sample # 3819). On the basis of ΣMe = 28 atoms per formula unit, the chemical formulae are Cu0.07(12)Pb11.71(18)As11.59(21)Sb4.63(9)S35.78(48) and Pb11.92(6)As10.12(14)Sb5.95(8)S36.76(32) for samples # 2987 and # 3819, respectively. The main diffraction lines, corresponding to multiple h k l indices, are [d in Å (relative visual intensity)]: 3.851 (s), 3.794 (s), 3.278 (s), 3.075 (s), 2.748 (vs), 2.363 (s), and 2.221 (vs). The crystal structure study gives a triclinic unit cell, space group P-1;, with a = 23.704 (8), b = 8.386 (2), c = 23.501 (8) Å, α = 89.91 (1), β = 102.93 (1), γ = 89.88 (1), V = 4553 (2)Å3, Z = 3. The crystal structure has been solved and refined to R1 = 0.088 on the basis of 7317 reflections with F0>4σ (F0). Bernarlottiite is a new N = 3.5 homeotype of the sartorite homologous series, with a 3a superstructure relative to that of baumhauerite. Its crystal structure can be described as being formed by 1:1 alternation of sartorite-type (N = 3) and dufrénoysite-type (N = 4) layers along c, connected by Pb atoms with tricapped trigonal prismatic coordination. Each layer results from the stacking of two types of ribbons along a, a centrosymmetric one alternating with two acentric ones. The three main building operators of the structure are (1) the interlayers As-versus-Pb-crossed substitution, stabilizing the combined N = (3, 4) baumhauerite homologue, (2) the inter-ribbon Sb partitioning in the sartorite-type layer, with “symmetrization” of the Sb-rich ribbon, that induces the 3a superstructure, and (3) the common (As, Sb) polymerization through short (As,Sb)–S bonds.
Marco E. Ciriotti

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

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TOSATO FABIO
Messaggi: 5831
Iscritto il: ven 13 gen, 2006 11:39
Località: via A.Cantele n.15 35129 PADOVA

Re: IMA 2013-133 = bernarlottiite

Messaggio da TOSATO FABIO » dom 05 feb, 2017 11:45

COMPLIMENTI 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: 23547
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: IMA 2013-133 = bernarlottiite

Messaggio da Marco E. Ciriotti » gio 28 set, 2017 9:58

Pubblicazione effettuata.


Referenza:
▪ Orlandi, P., Biagioni, C., Bonaccorsi, E., Moëlo, Y., Paar, W.H. (2017): Lead-antimony sulphosalts from Tuscany (Italy). XXI. Bernarlottiite, Pb12(As10Sb6)16S36, a new N = 3.5 member of the sartorite homologous series from the Ceragiola marble quarry: occurrence and crystal structure. European Journal of Mineralogy, 29, 713-726.

Abstract:
The new mineral species bernarlottiite, Pb12(As10Sb6)&ASigma;16S36, has been discovered in cavities of the Early Jurassic marbles from the Ceragiola quarry, Seravezza, Apuan Alps, Tuscany, Italy. Its name honours Bernardino Lotti (1847–1933) for his significant contribution to the knowledge of the geology of Tuscany and to the development of the Tuscan mining industry. It occurs as lead-grey acicular crystals up to 1mm in length and few μm in width, with a metallic lustre, associated with Sb-rich sartorite. Under the ore microscope, bernarlottiite is white with abundant red internal reflections; pleochroism is weak in air, with shades of grey-blue. Anisotropism is distinct to strong, with greyish-bluish rotation tints. Reflectance percentages for the four COM wavelengths are [Rmin, Rmax (%), (λ)]: 30.0, 37.5 (470 nm); 30.3, 37.3 (546 nm); 29.7, 36.8 (589 nm); and 29.3, 36.2 (650 nm). Electron-microprobe analyses, collected on two different grains, gave (in wt%): Cu 0.09 (16), Pb 48.89 (1.26), As 17.48 (22), Sb 11.36 (10), S 23.11 (32), total 100.93 (1.38) (sample # 2987) and Pb 47.43 (26), As 14.56 (24), Sb 13.92 (18), S 22.64 (17), total 98.56 (44) (sample # 3819). On the basis of ΣMe = 28 atoms per formula unit, the chemical formulae are Cu0.07(12)Pb11.71(18)As11.59(21)Sb4.63(9)S35.78(48) and Pb11.92(6)As10.12(14)Sb5.95(8)S36.76(32) for samples # 2987 and # 3819, respectively. The main diffraction lines, corresponding to multiple h k l indices, are [d in Å (relative visual intensity)]: 3.851 (s), 3.794 (s), 3.278 (s), 3.075 (s), 2.748 (vs), 2.363 (s), and 2.221 (vs). The crystal structure study gives a triclinic unit cell, space group P-1;, with a = 23.704 (8), b = 8.386 (2), c = 23.501 (8) Å, α = 89.91 (1), β = 102.93 (1), γ = 89.88 (1), V = 4553 (2)Å3, Z = 3. The crystal structure has been solved and refined to R1 = 0.088 on the basis of 7317 reflections with F0>4σ (F0). Bernarlottiite is a new N = 3.5 homeotype of the sartorite homologous series, with a 3a superstructure relative to that of baumhauerite. Its crystal structure can be described as being formed by 1:1 alternation of sartorite-type (N = 3) and dufrénoysite-type (N = 4) layers along c, connected by Pb atoms with tricapped trigonal prismatic coordination. Each layer results from the stacking of two types of ribbons along a, a centrosymmetric one alternating with two acentric ones. The three main building operators of the structure are (1) the interlayers As-versus-Pb-crossed substitution, stabilizing the combined N = (3, 4) baumhauerite homologue, (2) the inter-ribbon Sb partitioning in the sartorite-type layer, with “symmetrization” of the Sb-rich ribbon, that induces the 3a superstructure, and (3) the common (As, Sb) polymerization through short (As,Sb)–S bonds.
Marco E. Ciriotti

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

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TOSATO FABIO
Messaggi: 5831
Iscritto il: ven 13 gen, 2006 11:39
Località: via A.Cantele n.15 35129 PADOVA

Re: IMA 2013-133 = bernarlottiite

Messaggio da TOSATO FABIO » gio 28 set, 2017 12:51

BRAVISSIMI.
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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Di Domenico Dario
Messaggi: 5922
Iscritto il: ven 14 set, 2007 13:33
Località: Allumiere,Roma.

Re: IMA 2013-133 = bernarlottiite

Messaggio da Di Domenico Dario » gio 28 set, 2017 13:17

Era ora che all'illustre geologo toscano gli si dedicasse il nome di un minerale. :cheers:

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