Record details

Title
    Tuhé roztoky pyrargyritu a proustitu na vybraných ložiscích Českého masívu
Statement of responsibility
    Tomáš Řídkošil, Pavel Kašpar, Vladimír Šrein
Other titles
    Pyrargyrite-proustite solid solution
Author
    Kašpar, Pavel
    Řídkošil, Tomáš
    Šrein, Vladimír
Language
    česky
Source title - monograph
    Stříbrné minerální asociace v Československu
Pages
    s. 138-139
Notes
    6 bibl.
    Anglické resumé
Subject group
    Český masiv
    parageneze
    proustit
    pyrargirit
    rudy U
    stříbro
    sulfidy
    sulfosoli
Geographical name
    Bohutín (Příbram)
    ČR-Čechy
    Měděnec (Chomutov)
    Příbram-Březové Hory
    Třebsko (Příbram)
    Vrančice (Příbram)
Keyword
    Českého
    Ložiscích
    Masívu
    Proustitu
    Pyrargyritu
    Roztoky
    Tuhé
    Vybraných
Abstract (in english)
   Toulmin (1963) determined that pyrargyrite-proustite forms a complete solid solution from solidus temperature up to 300°C, but that a miscibility gap may exists below 300°C. Keighin and Honea (1969) determined that most natural samples of pyrargyrite contain small amounts of arsenic. Chemical composition were examined by electron probe microanalyses. Traverses of several pyrargyrite grains from Příbram ore district showed no systematic chemical variation or zoning. The mean composition is (Ag 3.05 Cu 0.01) (Sb 0.93 As 0.02) S 2.98. Pyrargyrite from Třebsko and Měděnec have intermediate composition in the solid solution series. Antimony and arsenic concentrations are the main variables: Ag 3.01 (Sb 0.62 As 0.36) S 3.00 and Ag 3.08 (Sb 0.47 As 0.47) S 3.00, respectively. Although copper is not a normal component of the pyrargyrite structure, minor amounts of copper to 0.21 wt. pour cent was recorded in pyrargyrite from Pošepný vein from Vrančice deposit.
   Proustite from Jáchymov and Měděnec have similar composition: Ag 3.02 As 0.98 Sb 0.01 S 3.00. Optical properties of pyrorgyrite or proustite are in accordance with lineary data. The X-ray diffraction data and cell parameters agrre well graph presented by Toulmin (1963) and Hess et al. (1986)
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    13. 12. 2007
Import date
    8. 8. 2012