...) a large crystal of giessenite overgrown by a mosaic composed of smaller crystals of giessenite, Ag-bearing galena, Ag-bearing tetrahedrite, bournonite and aikinite (the latter in the outermost rim); E–F) typical intergrowths of (Ag,Cu)-bearing cosalite containing grains of gustavite with Ag-bearing galena...

... from Iilijärvi, a satellite deposit within the Orijärvi orefield, southwest Finland, have revealed compositions approximating to the range Pb 5 Bi 4 Te 4 S 7 – Pb 7 Bi 4 Te 4 S 9 . These occur as fine intergrowths, rarely as larger single lamellae, also with aleksite, within a matrix of giessenite...

... homologs from the kobellite homologous series, a group of “chessboard derivative structures,” represented by Bi-, and Sb-rich pairs of natural phases (the kobellite-tintinaite isotypic series and giessenite-izoklakeite homeotypic series), we visualize the slabs underpinning crystal structural modularity...

... crystallized at temperatures of 300–230°C together with bismuth sulfides and native Bi, being preceded by numerous sulfosalts of bismuth, especially those enriched in Ag, such as gustavite, pavonite, benjaminite, berryite and giessenite. The substitution of Bi for Sb in tetrahedrite, coupled with an increase...

...Fig. 7. Mineral assemblages of the Lugokanskoe deposit. a , Typical relations of arsenopyrite and chalcopyrite with giessenite; b , myrmekite-like tetrahedryte inclusions in galena; c , bismuthine rim over arsenopyrite; d , native gold intergrown with bismuthine; e , native gold intergrown...

...Table 4. Calculated N values 1 for sulfosalts in this study compared with literature data. 1 Calculations used the formula for the tintinaite–kobellite and izoklakeite–giessenite series given by Moëlo et al. ( 1995 ): tintinaite–kobellite: (Cu 2– x Fe x )[Pb 10–2 z + x (Ag,Cu) z...

... = chalcopyrite, Gie/Izok = giessenite-izoklakeite, Gn = galena, Ja = jamesonite, Sp = sphalerite, Ttr = tetrahedrite. (Color online.) ...

... not far from the crystallographically ascertained ones. Tabulation in Zakrzewski & Makovicky (1986) shows that for izoklakeite and giessenite better estimates of N are obtained assuming univalent copper whereas for kobellite the two interpretations fall more equally on both sides of the right...

... ). Arsenopyrite is the most common ore mineral, and is accompanied by cassiterite, pyrrhotite, chalcopyrite, sphalerite, galena, stannite, and Cu(Ag)–Pb–Bi(Sb) sulfosalts, among which are aikinite, cosalite, gustavite, giessenite, berryite, tetrahedrite–tennantite, bournonite, wittichenite, and many others...

... for the distinction between two very close species ( e.g. , giessenite versus izoklakeite). Differences between the bonding strength and character of the metalloids (As, Sb, Bi) and metals, especially Pb, are less pronounced in sulfosalts than those between the bonding character in tetrahedral/triangular...

... 3 Bi 2 S 6 (Pb/Bi = 1.50), and covers compositions like Pb 8 Bi 6 S 17 (Pb/Bi = 1.33), initially attributed to giessenite ( Graeser 1963 , Strunz 1977 ), Pb 5 Bi 4 S 11 (Pb/Bi = 1.25), ascribed to bursaite ( Cioflica & Vlad 1974 , Strunz 1977 , Mozgova et al. 1988 , Mandarino 1999...