Introduction
Periodicals
Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze
2008/16/1
Uranopilit a jáchymovit z uranového ložiska Horní Slavkov
Uranopilit a jáchymovit z uranového ložiska Horní Slavkov
Jaromír Tvrdý, Jakub Plášil
| Pages | 61-64 |
|---|---|
| Citation | TVRDÝ, Jaromír a PLÁŠIL, Jakub. Uranopilit a jáchymovit z uranového ložiska Horní Slavkov. Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze. Prague: National Museum, 2008, 16(1), 61-64. ISSN 1211-0329 (print), 1804-6495 (online). Also available from: https://publikace.nm.cz/en/periodicals/bmpholnrhmvp/16-1/uranopilit-a-jachymovit-z-uranoveho-loziska-horni-slavkov |
Uranopilite from Horní Slavkov (Czech Republic) forms yellow crystalline aggregates of thick tabular crystals up to 0.5 mm. The aggregates seem to be a part of massive assemblages of uranyl supergene phases, so called „gummite”. Uranopilite is triclinic, with the space group P-1. The unit cell parameters refined from powder X-ray data are a = 8.881(7) Å, b = 13.98(1) Å, c = 14.42(1) Å, α = 97.08(6)°, β = 98.99(6)°, γ = 98.84(6)° and V = 1727(2) Å3. Chemical composition obtained from qualitative microanalysis matches well the composition of hydrated uranyl sulphate. In the powder diffraction pattern of uranopilite from Horní Slavkov few diffractions belonging to jáchymovite were found. Refined unit cell parameters of jáchymovite from composite pattern are a = 18.52(5) Å, b = 9.228(4) Å, c = 13.49(3) Å, β = 125.6(2)° and V = 1874(7) Å3. We assumed uranopilite and jáchymovite from Horní Slavkov are topotactically intergrowth. Both phases represent supergene uranyl minerals formed as in-situ alteration products of primary uranium minerals.
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