Výskyt vzácného seleničitanu, munakataitu, na haldě dolu Lill v Příbrami (Česká republika)

Pages

87-90

Citation

ČERNÝ, Petr, ČERNÝ, Pavel a SEJKORA, Jiří. Výskyt vzácného seleničitanu, munakataitu, na haldě dolu Lill v Příbrami (Česká republika). Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze. Prague: National Museum, 2010, 18(2), 87-90. ISSN 1211-0329 (print), 1804-6495 (online). Also available from: https://publikace.nm.cz/en/periodicals/bmpholnrhmvp/18-2/vyskyt-vzacneho-selenicitanu-munakataitu-na-halde-dolu-lill-v-pribrami-ceska-republika

Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze | 2010/18/2

The rare Pb-Cu selenate/sulphate, munakataite, was found at mine dump of the mine Lill, the Černojamské ore deposit, Příbram, central Bohemia (Czech Republic). Munakataite forms thin (1 - 3 μm) acicular crystals up to 400 μm in length forming hemispherical aggregates up to 1 mm in size on quartz gangue with brown sphalerite. Munakataite is brittle and its aggregates have staring sky-blue colour. The Fe- and Mn-oxides, tiny gypsum crystals and aggregates of Ca-rich pyromorphite were found in the close association. Chemical analyses of munakataite yielded average composition CaO 0.07 (0.00 - 0.11), PbO 52.52 (49.50 - 53.90), CuO 21.38 (20.47 - 22.25), ZnO 0.13 (0.00 - 0.23), SeO2 9.89 (8.24 - 10.77), P2O5 0.07 (0.00 - 0.17), SO3 12.12 (11.27 - 13.11), H2Ocalc. 4.77, total 100.95 wt. %, corresponding to empirical formula (Pb1.89Ca0.01)Σ1.90(Cu2.15Zn0.01)Σ2.16 [(SO4)1.21(Se4+O3)0.71(PO4)0.01]Σ1.93(OH)4.25 on the basis 6 apfu. The find of munakataite at mine dump of the Lill mine is the first occurrence of this rare mineral phase in the Czech Republic and also the first indicia of selenium mineralization in the Březové Hory ore district.

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