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Orlandi, P., Biagioni, C., Bonaccorsi, E., Moelo, Y. & Paar, W. H. (2017) Lead-antimony sulfosalts from Tuscany (Italy). XXI. Bernarlottiite, Pb-12(As10Sb6)Sigma S-16(36), 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. 
Added by: Richard Baschera (2018-03-23 13:15:38)   Last edited by: Richard Baschera (2018-03-23 14:02:32)
Type de référence: Article
DOI: 10.1127/ejm/2017/0029-2625
Clé BibTeX: Orlandi2017
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Catégories: IMN, INTERNATIONAL
Créateurs: Biagioni, Bonaccorsi, Moelo, Orlandi, Paar
Collection: European Journal of Mineralogy
Consultations : 3/431
Indice de consultation : 2%
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Résumé     
{The new mineral species bernarlottiite, Pb-12(As10Sb6)Sigma S-16(36), 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 mu m 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 [R-min, R-max (%), (lambda)]: 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, give (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 Sigma Me= 28 atoms per formula unit, the chemical formulae are Cu-0.07(12) Pb-11.71(18) As-11.59(21) Sb-4.63(9) S-35.78(48) and Pb-11.92(6) As-10.12 (14) Sb-5.95(8) S-36.76(32) for samples # 2987 and # 3819, respectively. The main diffraction lines, corresponding to multiple h k l indices, are [d in angstrom (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) over bar, with a = 23.704 (8)
  
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