ISSN
print 2570-7337
online 2570-7345
Neobvyklá asociace supergenních minerálů uranu ze žíly Jan Evangelista, Jáchymov (Česká republika)
Unusual association of supergene uranium minerals from the Jan Evangelista vein, Jáchymov (Czech Republic)
Klíčová slova
Abstrakt
An unusual association of supergene uranium minerals was found at old abandoned mine working at area of the Jan Evangelista vein, Daniel level of mine Svornost, central part of the Jáchymov ore district, Krušné hory Mountains, Czech Republic. Sklodowskite occurs there as rich whitish yellow fine crystalline agregates at area up to 2 x 3 cm of strongly supergene altered gangue formed by tiny acicular crystals up to 10 μm in length. It is monoclinic, space group C2/m; the unit-cell parameters refined from X-ray powder diffraction data are: a 17.36(1), b 7.054(4), c 6.619(5) Å, β 105.79(7)o and V 780(1) Å3; its chemical analyses correspond to the empirical formula (Mg0.92Fe0.01Ni0.01Cu 0.01Co0.01Ca0.01)Σ0.97(UO2)2 (SiO3OH)2.01(SO4)0.04(PO4)0.02(AsO4)0.01.6H2O on the basis 2 apfu U. Compreignacite forms yellow irregular aggregates up to 3 mm in size at area up to 1 x 1 cm of altered gangue with rare prismatic crystals up to 20 μm. It is orthorhombic, space group Pnnm; the unit-cell parameters refined from X-ray powder diffraction data are: a 14.847(2), b 7.212(1), c 12.151(4) Å, and V 1301.1(3) Å3; its chemical analyses correspond to the empirical formula (K1.07Na0.05Pb0.04Mg0.03Cu0.02Ni0.02Al0.02)Σ1.25 [(UO2)6O4(SiO4)0.08(OH)5.16].7H2O on the basis 6 apfu U. Two chemically different types of fourmarierite were found. Pb-deficient and K-rich fourmarierite F1 forms dark yellowish orange to orange fine crystalline aggregates up to 2 mm in size with tiny tabular crystals up to 20 μm. It is orthorhombic, space group Bb21m, the unit-cell parameters refined from X-ray powder diffraction data are: a 14.025(2), b 16.469(3), c 14.623(2) Å, and V 3378(2) Å3; its chemical analyses are given in the tables.
Fourmarierite F2 is more rare, it occurs as orange red or orange brown aggregates in association with compreignacite. It is orthorhombic, space group Bb21m, the unit-cell parameters refined from X-ray powder diffraction data are: a 13.442(5), b 16.611(6), c 14.447(2) Å, and V 3226(1) Å3; its chemical analyses are given in the tables.
Unnamed „Na-metaschoepite“ forms pale yellowish orange powdery or fine crystalline aggregates up to 3 mm in size is association with compreignacite, fourmarierite and gypsum. It is orthorhombic, space group Pbcn, the unit-cell parameters refined from X-ray powder diffraction data are: a 14.025(2), b 16.469(3), c 14.623(2) Å, and V 3378(2) Å3; its chemical analyses correspond to the empirical formula (Na0.30Cu0.13Al0.13K0.08Pb0.07Ca0.06Mg0.06Mn0.02Zn0.02Fe0.02Ni0.01Co0.01)Σ0.91 [(UO2)4O2(SiO4)0.26(SO4)0.02(OH)4.46] .5H2O on the basis of 4 apfu U. The origin of described mineral association is interpreted as product of (sub)recent weathering of primary uraninite in neutral of only low acid conditions.
Soubory
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