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Adolfpateraite, monoclinic K(UO 2 )(SO 4 )(OH)(H 2 O), is a new supergene mineral from the Svornost mine, Jáchymov ore district, Czech Republic. It forms sulfur yellow to greenish yellow crystalline aggregates, up to 2 mm in diameter. Crystals are transparent to translucent with a vitreous luster, without observable cleavage. The streak is pale yellow. The Mohs hardness is ~2. The mineral shows a green fluorescence in long-wave ultraviolet radiation. Adolfpateraite is pleochroic, with α = colorless and γ = yellow (β could not been examined). It is biaxial, with α = 1.597(2), γ = 1.659(2) (β could not been measured), birefringence 0.062. The empirical chemical formula (mean of 4 electron microprobe point analyses) was calculated based on 8 O apfu and is K 0.94 (UO 2 ) 1.00 (SO 4 ) 1.02 (OH) 0.90 (H 2 O) 1.00  (water content calculated). The simplified formula is K(UO 2 )(SO 4 )(OH)(H 2 O), requiring K 2 O 10.70, UO 3  64.97, SO 3  18.19, H 2 O 6.14, total 100.00 wt%. Adolfpateraite is monoclinic, space group P2 1 /c, a = 8.0462(1), b = 7.9256(1), c = 11.3206(2) Å, β = 107.726(2)°, V = 687.65(2) Å 3 , Z = 4, and D calc  = 4.24 g/cm 3 . The five strongest reflections in the X-ray powder diffraction pattern are [dobs in Å (I) (hkl)]: 7.658 (76) (100), 5.386 (100) (002), 5.218 (85) (1̅02), 3.718 (46) (021), 3.700 (37) ( 2̅02). The crystal structure has been refined from single-crystal X-ray diffraction data to R 1  = 0.0166 with GOF = 1.30, based on 1915 observed reflections [I obs  &gt; 3σ(I)]. The crystal structure consists of chains of uranyl polyhedra extended along [010], with OH -  located on the shared vertex between the bipyramids. The sulfate tetrahedra decorate the outer side of the chain with bridging bidentate linkages between the uranyl pentagonal bipyramids. H 2 O groups are located on the edges of the chains on the non-linking vertex of each uranyl pentagonal bipyramid. K +  atoms are located between the chains providing additional linkage of these together with H-bonds. The fundamental vibrational modes of uranyl ion, sulfate tetrahedra, and H 2 O groups were tentatively assigned in the infrared and Raman spectra. The new mineral is named to honor Adolf Patera (1819-1894), Czech chemist, mineralogist, and metallurgist.

Adolfpateraite, K(UO 2 )(SO 4 )(OH)(H 2 O), a new uranyl sulphate mineral from Jáchymov, Czech Republic