... polyhedra. Ralphcannonite is derived from its isotype routhierite M 1 Cu M 2 Hg 2 TlAs 2 S 6 through the double heterovalent substitution M 1 Cu + + M 2 Hg 2+ → M 1 Zn 2+ + M 2 Ag + . This substitution obeys a steric constraint, with Ag + , the largest cation relative to Zn 2+ and Cu + , entering...

...Cristian Biagioni; Elena Bonaccorsi; Yves Moëlo; Paolo Orlandi Abstract Routhierite, ~ (Cu 0.8 Ag 0.2 )Hg 2 Tl(As 1.4 Sb 0.6 ) ∑=2 S 6 , was identified in the baryte+pyrite+iron oxide ore from Monte Arsiccio mine, Apuan Alps, Tuscany, Italy. Routhierite occurs as anhedral grains up to 0.5 mm...

... reflections. It shows a three dimensional framework of (Hg,Ag)-centred tetrahedra (1 M 1 + 2 M 2), with channels parallel to [001] hosting TlS 6 and (As,Sb)S 3 disymmetric polyhedra. Arsiccioite is derived from its isotype routhierite M 1 Cu M 2 Hg 2 TlAs 2 S 6 through the double heterovalent substitution M 1...

..., ranging from 0.05 to 0.5 mm in length. In the studied specimens, parapierrotite is associated with sphalerite, zinkenite, tetrahedrite, and routhierite or with stibnite, protochabournéite, and routhierite. Chemical analysis indicated the presence of a Pb-bearing variety of parapierrotite; the electron...

...Fig. 4. Chemical composition of the members of the routhierite isotypic series, M + M 2+ 2 TlAs 2 S 6 . Symbols: light blue triangles = arsiccioite; violet squares = routhierite from Monte Arsiccio mine; orange squares = routhierite from Jas Roux; blue circles = stalderite; red circles...

... and anhedral grains of the same size embedded in the matrix of Mn-bearing dolomite and Mn-bearing calcite. Associated minerals include pyrite, orpiment, realgar, stibnite, aktashite, alabandite, boscardinite, chabournéite, coloradoite, clerite, écrinsite, gold, routhierite, sphalerite and twinnite. Luboržákite...

... Stazzema (Apuan Alps, Tuscany, Italy). It occurs as compact masses associated with barite, boscardinite, calcite, cymrite, dolomite, pyrite, realgar, routhierite, sphalerite, and stibnite. Protochabournéite is metallic black. Minimum and maximum reflectance data for COM wavelength are [λ (nm): R air...

...Figure 2. Backscattered electron images of Tl-Hg-As-Sb-(Ag,Cu)-Pb sulfosalts showing melt-related textures. A: Interstitial protochabournéite and Ag-routhierite association within barite crystal matrix. B: Barite ore showing interstitial protochabournéite. C: Complex sulfosalt association...

...Fig. 3. Structural fragments of the crystal structure of tetrahedrite group ( a ), galkhaite group ( b ), and routhierite group minerals ( c ), organised around the Laves polyhedra, showing their topological relationships. Polyhedra: grey =  M (1) site in tetrahedrites, (Hg/Fe,Cu) site...

... accord with structural data. Thallium was grouped along with other formally monovalent cations (Cu, Ag), although it is more likely that it could replace S at the S(2) position, assuming a configuration similar to that observed in routhierite-group or in galkhaite-group minerals (e.g. Borisov et al...