Bulletin Mineralogie Petrologie

An interesting occurrence of selenides, clausthalite and tiemannite, was determined at sample from mine dump material at the abandoned uranium ore occurrence Velká located near Milevsko, southern Bohemia (Czech Republic). Clausthalite forms abundant irregular aggregates up to 300 μm in size between the spherical aggregates of uraninite, which is intensively replaced by coffinite. It is cubic, space group Fm3m, unit-cell parameter refined from PXRD is a 6.1252(2) Å and V 229.80(2) ų. An irregular minority contents of Cu (up to 0.01 apfu), Tl (up to 0.004 apfu), Ag and Bi (up to 0.003 apfu) were found during study of its chemical composition; determined sulphur contents are very low, about 0.01 - 0.02 apfu S were found only at two point analyses. More rare tiemannite was found as aggregates up to 500 μm accross in fractures of quartz gangue. It is cubic, space group F4-3m, unit-cell parameter refined from PXRD is a 6.0850(2) Å and V 225.31(3) ų and its empirical formula is Hg_0.99(Se_1.00S_0.01)_Σ1.01. In association with selenides, abundant chalcopyrite and more rare pyrite with minor selenium contents were determined.

Boctor NZ, Kullerud G (1986) Mercury selenide stoichiometry and phase relations in the mercury-selenium system. J Solid State Chem 62: 177-183

Burnham Ch W (1962) Lattice constant refinement. Carnegie Inst Washington Year Book 61: 132-135

Coleman RG (1959) The natural occurrence of galena - clausthalite solid solution. Am Mineral 44: 166-174

Earley JW (1950) Description and synthesis of the selenide minerals. Am Mineral 35: 337-364

Förster HJ (2005) Mineralogy of the U-Se-polymetallic deposit Niederschlema-Alberoda, Erzgebirge, Germany. IV. The continuous clausthalite-galena solid-solution series. N Jb Mineral, Abh 181(2): 125-134

Johan Z, Picot P, Ruhlmann F (1982) Evolution paragénétique de la minéralisation uranifère de Chaméane (Puy-de-Dôme), France: chaméanite, geffroyite et giraudite, trois séléniures nouveaux de Cu, Fe, Ag et As. Tschermaks Mineral Petrogr Mitt 29: 151-167

Litochleb J, Černý P, Šrein V. (1994) Charakteristika polymetalické a fluoritové mineralizace z Velké u Milevska. Sbor Jihočes Muz, přír Vědy 34(1-2): 19-32

Noda Y, Masumoto K, Ohba S, Saito Y, Toriumi K, Iwata Y, Shibuya I (1987) Temperature dependence of atomic thermal parameters of lead chalcogenides, PbS, PbSe and PbTe. Acta Cryst C43: 1443-1445

Ondruš P (1993) ZDS - A computer program for analysis of X-ray powder diffraction patterns. Materials Science Forum, 133-136, 297-300, EPDIC-2. Enchede.

Pouchou JL, Pichoir F (1985) “PAP” (φρZ) procedure for improved quantitative microanalysis. In: Microbeam Analysis (J. T. Armstrong, ed.). San Francisco Press, San Francisco, 104-106.

Rus V (1965) Závěrečná zpráva o geologicko-průzkumných pracech na úseku Velká ve Středočeském plutonu. MS DIAMO SUL. Příbram

Sejkora J, Škácha P (2015a) Selenidy z fluoritového ložiska Moldava v Krušných horách (Česká republika). Bull mineral-petrolog Odd Nár Muz (Praha) 23(2): 229-241

Sejkora J, Škácha P (2015b) Výskyt selenidů na ložisku Běstvina v Železných horách (Česká republika). Bull mineral-petrolog Odd Nár Muz (Praha) 23(2): 255-260

Sejkora J, Šrein V, Šreinová B, Kopecký S sen, Kopecký S jun (2016) Výskyt clausthalitu na uranovém rudním výskytu Boučí u Oloví, Krušné hory (Česká republika). Bull mineral-petrolog Odd Nár Muz (Praha) 24(2): 238-242

Simon G, Essene EJ (1996) Phase relations among selenides, sulfides, tellurides, and oxides. I. Thermodynamic properties and calculated equilibria. Econ Geol 91: 1183-1208

Simon G, Kessler S E, Essene EJ (1997) Phase relations among selenides, sulfides, tellurides, and oxides. II. Application to selenide-bearing ore deposits. Econ Geol 92: 468-484

Škácha P, Sejkora J, Plášil J (2017) Selenide mineralization in the Příbram uranium and base-metal district (Czech Republic). Minerals 7: 91.

Wyckoff RWG (1963) Crystal structures 1. Second edition. Intenscience Publishers, New York

Yvon K, Jeitschko W, Parthé E (1977) Lazy Pulverix, a computer program for calculation X-ray and neutron diffraction powder patterns. J Appl Cryst 10: 73-74