Cristallochimie de l'owyheeite: nouvelles donn�es

Ag-Pb-Sb Sulfosalts and Se-rich Mineralization of Anthony of Padua Mine near Poličany—Model Example of the Mineralization of Silver Lodes in the Historic Kutná Hora Ag-Pb Ore District, Czech Republic

“…position of owyheeite (Table 7) is close to ideal formula Ag3Pb10Sb11S28 al. [44], with a slight deficit of Pb and an excess of Sb. Figure 7 shows that ents Ag, Pb and Sb do not correlate significantly and the 2Pb↔Ag + Sb by Moëlo et al [45] is not the dominant factor in the chemical composition of ined contents of selenium in the studied mineral are relatively low (0.…”

“…Ag content varies from 17.41 to 18.48 wt.%, corresponding to 2.93 to 3.15 apfu Ag, which is appreciably less than a typical common member of the tetrahedrite series, which is freibergite on all lodes of the Kutná Hore ore district. The chemistry is similar to freibergite in the respect that iron prevails over zinc, no arsenic substitutes for antimony (Table 17), and the substitution of Se for S is non-existent, although surrounding minerals contain as much as 1.1 wt.% of Se authors have proposed a minimum content for freibergite of 4 apfu Ag [44,58], and a condition of Ag > Cu for argentotennantite (about 5 apfu Ag) [59]. On the basis of the results of crystal structure studies [58,60] and analyses of natural samples [61,62], Ag preferentially occupies the triangular A position with total content 6 apfu, and according to the present rules of mineralogical nomenclature [31], the boundary would be 3 apfu Ag [62].…”

“…The status of Ag-rich members of tetrahedrite group (freibergite, argentotennantite) and especially their boundaries with tetrahedrite and tennantite, is still being investigated [44]. Some authors have proposed a minimum content for freibergite of 4 apfu Ag [44,58], and a condition of Ag > Cu for argentotennantite (about 5 apfu Ag) [59].…”

“…The status of Ag-rich members of tetrahedrite group (freibergite, argentotennantite) and especially their boundaries with tetrahedrite and tennantite, is still being investigated [44]. Some authors have proposed a minimum content for freibergite of 4 apfu Ag [44,58], and a condition of Ag > Cu for argentotennantite (about 5 apfu Ag) [59]. On the basis of the results of crystal structure studies [58,60] and analyses of natural samples [61,62], Ag preferentially occupies the triangular A position with total content 6 apfu, and according to the present rules of mineralogical nomenclature [31], the boundary would be 3 apfu Ag [62].…”

Comparative modular analysis of two complex sulfosalt structures: sterryite, Cu(Ag,Cu)3Pb19(Sb,As)22(As–As)S56, and parasterryite, Ag4Pb20(Sb,As)24S58

“…Owyheeite is a rare Pb-Ag-Sb sulfosalt whose composition shows a narrow solid-solution field around stoichiometric Ag 3 Pb 10 Sb 11 S 28 (Moë lo et al, 1984). Its crystal structure (Fig.…”