...H. Yang; R.T. Downs; S.H. Evans; M.N. Feinglos; K.T. Tait Abstract Uchucchacuaite, ideally AgMnPb 3 Sb 5 S 12 , was originally reported as orthorhombic, with possible space group Pmmm , P 222, or Pmm 2, and unit-cell parameters a = 12.67, b = 19.32, and c = 4.38 Å obtained from powder X-ray...

...Figure 2. Reflectivity curves for menchettiite in air. Filled symbols refer to uchucchacuaite ( Moëlo et al. 1984 ), open symbols refer to menchettiite (this study). Squares and circles refer to R max and R min values, respectively. ...

...Fig. 2. Fragment (0.5 × 1.5 × 2 cm) of a vein containing a rich sulfide-sulfosalt assemblage with lead-gray chukotkaite closely intergrown with diaphorite, galena, jamesonite, owyheeite and uchucchacuaite, brass yellow grains of pyrrhotite, black sphalerite, and colorless quartz. ...

... that share two common S atoms via short bonds. Relationships to, and differenced from, fizelyite and uchucchacuaite are described and discussed. Ramdohrite crystal structure fizelyite-andorite series Pb-Ag-Sb sulfosalt The andorite–fizelyite substitution series, ideally Pb 3 Sb 2 S 6 –PbAgSbS 3...

...] Ramdohrite Cd 0.5 Ag 2.75 Pb 6 Sb 10.75 S 24 8.74 19.31 13.05 90.18 ( A E / A L )   P 2 1 / n 2 [4] Uchucchacuaite Mn 2 Ag 2 Pb 6 Sb 10 S 24 8.76 19.36 12.73 90.06 ( A E / A L ) 2158.5 P 2 1 / n 2 [5]   n  = 4                       Andreadiniite CuAg 7...

..., Ag 4 MnSb 2 S 6 ( Werner and Fraatz 1910 ); in the 1980s other sulfosalts of this element were found, i.e., benavidesite, Pb 4 (Mn,Fe)Sb 6 S 14 ( Oudin et al. 1982 ), uchucchacuaite, AgMnPb 3 Sb 5 S 12 ( Moëlo et al. 1984 ), and clerite, MnSb 2 S 4 ( Murzin et al. 1996 ), all of them being...

... – phase X 1 /plagionite, is confirmed by the coexistence of these two sulfosalts within the same “mineral grain” as observed by optical microscopy, only discernible with the help of EPMA data. The chemical composition of phase X 3 is close to uchucchacuaite (ideally AgPb 3 MnSb 5 S 12...

... is an Mn-rich phase, uchucchacuaite ( Moëlo et al. , 1984 b ), ideally with 50% substitution ( Table 2 ). However, understanding the nature and nomenclature of the members with lower degrees of substitution is far from clear (see Fig. 5 and the calculated values below), because the combination...

... slabs of the structure ( Makovicky et al ., 1977a and b ) is on the level of uchucchacuaite ( Moëlo et al ., 1989 ; Yang et al ., 2011 ) and also contains Mn 2+ , jasrouxite is heavily oversubstituted beyond the theoretical limit of PbAg(Sb,As) 3 S 6 , with a part of prismatic Pb sites (see below...

.... In addition, during study of the alabandite zone other minerals chemically related to agmantinite, such as stannite, kësterite and keutschite were found. The Uchucchacua deposit is unusual for the occurrence of Ag–Mn bearing minerals (uchucchacuaite, manganoquadratite, menchettiite, oyonite and agmantinite...

.... ( 2009 ): Structure refinement of an untwinned single crystal of Ag-excess fizelyite, Ag 5.94 Pb 13.74 Sb 20.84 S 48 . Can. Mineral. , 47 , 1257 – 1264 . Yang H. Downs R.T. Evans S.H. Feinglos M.N. Tait K.T. ( 2011 ): Crystal structure of uchucchacuaite, AgMnPb 3 Sb 5 S...

... in temperature. Bussell et al. (1990) ascribe orpiment, marcasite and siderite to a supergene stage, together with Mn oxides, goethite and cerussite. This deposit was a source of benavidesite ( Leone et al ., 2003 ), uchucchacuaite (AgMnPb 3 Sb 5 S 12 , Moëlo et al ., 1984 ), and the Socorro section...

...-mail: [email protected] The Fe analogue of uchucchacuaite Monoclinic: P 2 1 / n ; structure determined a  = 8.7150(5), b  = 12.737(1), c  = 19.350(1) Å, β = 90.062(5)° 3.794(24), 3.791(19), 3.475(28), 3.472(34), 3.307(100), 2.902(40), 2.900(36), 2.179(22) Type material is deposited...

... ), uchucchacuaite, MnAgPb 3 Sb 5 S 12 (And 50 ), and roshchinite, (Ag,Cu) 19 Pb 10 Sb 51 S 96 (And 118.75 ). Depending on chemical composition, the c dimension of minerals in the andorite subgroup varies by an integral number: c = (4.36 × n ) Å, where n = 2, 4, or 6. In fizélyite and ramdohrite...