Arsenmarcobaldiite, Pb12(As3.2Sb2.8)Σ=6S21, a new N = 3.5 jordanite homologue from the Sant’Anna tectonic window, Apuan Alps (Tuscany, Italy)
| Autor: | Yves Moëlo, Federica Zaccarini, Stefano Merlino, Werner H. Paar, Simone Vezzoni, Marco Pasero, Cristian Biagioni |
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| Přispěvatelé: | University of Pisa - Università di Pisa, Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), University of Salzburg, Consiglio Nazionale delle Ricerche [Pisa] (CNR PISA), University of Leoben (MU) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
05 social sciences
Geochemistry chemistry.chemical_element Window (geology) 010502 geochemistry & geophysics 01 natural sciences arsenmarcobaldiite jordanite homologous series new mineral species lead arsenic antimony crystal structure sulfosalt Apuan Alps Tectonics Antimony chemistry Geochemistry and Petrology 0502 economics and business [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 050211 marketing Geology ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences |
| Zdroj: | European Journal of Mineralogy European Journal of Mineralogy, Copernicus, 2019, 31 (5-6), pp.1067-1077. ⟨10.1127/ejm/2019/0031-2888⟩ European journal of mineralogy 31 (2021): 1067–1077. doi:10.1127/ejm/2019/0031-2888 info:cnr-pdr/source/autori:Biagioni C.[1], Moëlo Y.[2], Merlino S.[1], Pasero M.[1], Paar W.H.[3], Vezzoni S.[4], Zaccarini F. [5]/titolo:Arsenmarcobaldiite, Pb12(As3.2Sb2.8)summation =6S21, a new N = 3.5 jordanite homologue from the Sant'Anna tectonic window, Apuan Alps (Tuscany, Italy)/doi:10.1127%2Fejm%2F2019%2F0031-2888/rivista:European journal of mineralogy (Print)/anno:2021/pagina_da:1067/pagina_a:1077/intervallo_pagine:1067–1077/volume:31 |
| ISSN: | 0935-1221 |
| DOI: | 10.1127/ejm/2019/0031-2888⟩ |
| Popis: | The new mineral species arsenmarcobaldiite, Pb12(As3.2Sb2.8) summation=6S21, occurs as black anhedral grains, up to 0.5 mm in size, with metallic lustre, associated with pyrite and minor sphalerite, within layers of granoblastic quartz and accessory baryte embedded in pyrite-rich schist from a small baryte + pyrite prospect at Verzalla, Stazzema, Apuan Alps, Tuscany, Italy. Under the ore microscope, arsenmarcobaldiite is white. It is weakly pleochroic in shades of grey. Anisotropy is distinct, both in air and oil, with rotation tints from brownish to bluish-grey. Reflectance percentages for the four COM wavelengths are [Rmin, Rmax (%), (lamda)]: 32.8, 38.3 (470 nm); 32.2, 37.5 (546 nm); 31.7, 36.9 (589 nm); 31.4, 36.6 (650 nm). Polysynthetic twinning is common and characteristic. Electron microprobe analysis gave (in wt% - average of 19 spot analyses): Ag 0.20(1), Pb 66.34(38), As 6.36(10), Sb 8.93(9), Bi 0.30(5), S 18.00(14), total 100.13(48). On the basis of summationMe = 18 atoms per formula unit, the chemical formula is Ag0.07(1)Pb11.96(5)(As3.17(4)Sb2.74(3)Bi0.05(1))summation5.96S20.97(17), ideally Pb12(As3.2Sb2.8)summation=6S21. The main diffraction lines, corresponding to multiple hkl indices, are [d in Å (relative visual intensity)]: 3.595 (m), 3.429 (m), 3.214 (ms), 3.027 (ms), 2.233 (s), 2.125 (ms), 1.839 (ms). The X-ray diffraction study gave a triclinic unit cell, space group P1, with a = 8.9736(9), b = 29.334(3), c = 8.4925(10) Å, alfa = 98.369(6), beta= 118.705(6), gamma= 90.874(6)O, V = 1930.5(4) Å3 , Z = 2. The crystal structure was solved and refined to R1 = 0.063 on the basis of 6325 reflections with Fo > 4sigma (Fo) and 364 refined parameters. Arsenmarcobaldiite is a new N = 3.5 homologue belonging to the jordanite homologous series and it is the As-dominant isotype of marcobaldiite. |
| Databáze: | OpenAIRE |
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