...Emil Makovicky; William G. Mumme; Robert W. Gable Abstract The crystal structure of ramdohrite, Pb 5.9 Fe 0.1 Mn 0.1 In 0.1 Cd 0.2 Ag 2.8 Sb 10.8 S 24 , from the Chocaya mine, Potosí, Bolivia, determined by Makovicky and Mumme from film data in 1983, was refined from single-crystal diffractometer...

... with ramdohrite and fizélyite, with monoclinic symmetry ( P 2 1 / n ) and the unit-cell parameters a = 19.3645(11), b = 12.7287(8), c = 8.7571(6) Å, β = 90.059(3)° for R100213 and a = 19.3462(7), b = 12.7251(5), c = 8.7472(3) Å, β = 90.017(2)° for R070760 . Both samples are pervasively twinned and the twin...

... Ag atom per formula unit than in the ideal composition, Ag 5 Pb 14 Sb 21 S 48 , presently proposed by the IMA for fizélyite. Except for an additional partially occupied Ag site (Ag2) and two split cation sites (Ag1 and M 2) in our sample, fizélyite is isostructural with ramdohrite, CdAg 5.5 Pb 12...

...Figure 5. Reflectance curve for holubite from Kutná Hora. For comparison, the curves for staročeskéite from Kutná Hora (Pažout and Sejkora, 2018 ) and ramdohrite from Chocaya, Bolivia (Picot and Johan, 1982 ) are shown. ...

... to be topologically identical to those of ramdohrite, uchucchacuaite, and fizélyite. The six strongest X-ray powder-diffraction lines [ d in Å ( I/I 0 ) ( hkl )] are: 3.4066 (39) (3̄12), 3.4025 (39) (312), 3.2853 (100) (520), 2.8535 (50) (2̄32), 2.8519 (47) (232), and 2.1190 (33) (004). Electron-microprobe analyses...

... changed and the CO 2 /S ratio increased, causing dissolution of alabandite and the deposition of abundant rhodochrosite and a second generation of arsenopyrite, pyrite and quartz, sphalerite with chalcopyrite inclusions, mirargyrite, ramdohrite, and finally stibnite. This polymetallic ore probably formed...

... and 90 mole percent PbS at 400°C, and at 300°C the presence of two small solid solutions between 50 and 52 mole percent PbS, and 25 and 40 mole percent PbS. Another solid solution includes the compositions of andorite (PbAgSb 3 S 6 ), ramdohrite (Pb 3 Ag 2 Sb 6 S 13 ), and fizelyite (Pb 5 Ag 2 Sb 8 S 18...

... for the two species. Ramdohrite = andorite VI. * Publication authorized by the Director, U.S. Geological Survey. Copyright © 1954 by the Mineralogical Society of America 1954 Mineralogical Society of America ...

...] 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...

... Åfor ramdohrite and fizelyite, Table 1 ). Table 1. Some natural members of the lillianite homologous series. Mineral Composition Type – Structure solved Symmetry/S.G. Lillianite Pb 3 Bi 2 S 6 4,4 L – yes Bbmm Xilingolite Pb 3 Bi 2 S 6 4,4 L – yes C 2/ m...

...F ig . 6. The crystal structure of ramdohrite Pb 5.9 Fe 0.1 Mn 0.1 In 0.1 Cd 0.2 Ag 2.8 Sb 10.8 S 24 ( Makovicky et al. , 2013 ). Large spheres: S; grey spheres: Pb; white spheres: Sb; black spheres: Ag. Large and small lone electron-pair micelles (with cores indicated by ellipses) alternate...

... ; Pauliš, 1998 ; Pažout, 2017 ; Pažout et al ., 2017 ). The new mineral was found in quartz gangue in the rich Ag–Pb–Bi–Sb sulfosalt association (gustavite, terrywallaceite, vikingite, treasurite, eskimoite, erzwiesite, Bi-rich fizelyite and Bi-rich ramdohrite) accompanied by Ag- and Bi-bearing...

.... Part II: definition of new minerals: eskimoite, vikingite, ourayite and treasurite. Redefinition of schirmerite and new data on the lillianite–gustavite solid-solution series . N. Jb. Mineral. Abh. , 131 , 56 – 82 . Makovicky E. Mumme W.G. ( 1983 ): The crystal structure of ramdohrite...

... facies ore is clearly late to post-metamorphism (Basu, 198I ; Basu et al 1981 c). Presence of ramdohrite group of minerals (Basu, 1981) and of gudmundite in this later facies indicates a maximum temperature ~300°C (Hoda and Chang, 1975). The reaction rim occurs as lamellar myrmekitic intergrowth...

... not follow a crankshaft scheme of short metalloid-sulphur bonds but is close to that observed in ramdohrite ( Makovicky & Mumme, 1983 ). Type D plane ( Fig. 3d ) forms a pair of identical layers embracing the inversion centre at y = 1/2, z = 0. The trapezoidal scheme is strictly maintained...