Navrotskyite, K2Na10(UO2)3(SO4) 92H2O, a new sodium and potassium uranyl-sulfate mineral from the Blue Lizard mine, Red Canyon, White Canyon District, San Juan County, Utah
JOURNAL OF GEOSCIENCES（2023）
摘要
Navrotskyite (IMA 2019-026), K2Na10(UO2)(3)(SO4)(9)2H(2)O, is a new potassium-sodium-uranyl-sulfate mineral from the Blue Lizard mine, San Juan County, Utah, USA. The new mineral occurs on sandstone and asphaltite matrix in close association with belakovskiite, bl & ouml;dite, bobcookite, changoite, fermiite, ferrinatrite, ilsemannite, ivsite, meisserite, pseudomeisserite-(NH4), seaborgite and tamarugite. Navrotskyite is orthorhombic, space group Pbcm (#57), with unit cell parameters a = 5.4456(13), b = 21.328(5), c = 33.439(8) & Aring;, V = 3883.8(2) & Aring;(3 )and Z = 4. Crystals are acicular tapered needles up to about 1 mm in length, typically occurring as radial sprays and tightly intergrown aggregates resembling fibre-optic bundles. Crystals are elongated on [100] and exhibit only the {012} prism form, resulting in diamond-shaped cross-sections. The terminations are generally not well-formed, but broken crystals are truncated by good {100} cleavage. No twinning was observed. Navrotskyite is pale greenish yellow in color, has a white or very pale-yellow streak and fluoresces neon yellow green under both long- and short-wave UV. It is transparent with vitreous to silky luster. The mineral exhibits a splintery, uneven fracture and has a Mohs hardness of about 2. The calculated density based on the empirical formula is 3.46 g/cm(3). The mineral is optically biaxial (-), with alpha = 1.520(2), beta = 1.557(2) and gamma = 1.565(2) (white light). The measured 2V is 48.2(5)degrees and the calculated 2V is 48.9 degrees. Dispersion is imperceptible and no pleochroism was observed. The optical orientation is X = a, Y = c, Z = b. The empirical formula is K(2.06)Na(9.98)U(3.02)S(8.98)O(44)H(3.97 )based on 44 O apfu. The eight strongest powder X-ray diffraction lines are [d(obs) & Aring;(I)(hkl)]: 5.28(100)(110), 3.050(44)(049, 119), 10.70(43)(020), 3.845(36)(046,134,116), 3.225(30)(153), 3.533(29)(060,061,136), 2.822(29)(139) and 5.59(27)(006). The crystal structure of navrotskyite (R-1 = 0.0289 for 4032 reflections with I > 2 sigma I) contains infinite [(UO2)(SO4)(3)](4- )chains that extend along [100] and that link to neighbouring chains via a complex network of K-O and Na-O bonds. Related topologies based on the same UL3-type chain are also observed in the minerals fermiite, meisserite and pseudomeisserite-(NH4), all of which occur in the same general assemblage as navrotskyite.
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关键词
Navrotskyite,uranyl sulfate,uranium,crystal structure,chains,Raman
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