First Occurrence of Nolanite in China
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    Abstract:

    Nolanite was found for the first time in China from a sandstone-type uranium deposit in Sichuan province. It occurs in the dark gray medium-fine -grained lithic sandstone of a terrestrial red elastic rock formation in the basal part of the Lower Cretaceous. The associated mineravls are pitchblende, coffinite, pyrite and ferroselite. The nolanite` is black and brittle, with pris- snatic and sheetlike single crystals and aggregates appearing in vugs. Cross- section hexagonal. Microhardness: 460-765kg/mm on longitudinal section, 275- 382kg/mm2 on cross-section. Under reflected light, it appears creamy in color, parallel to C axis, but colorless along vertical C axis. It is strongly anisotro- pi, brown to dull blue along。axis, and approximately isotropic in the base section. Reflectance values; Rs-15.6-16.65 (440-66Onm),Rω-14.43- 14.86 (440-660nm).Color indices; Rvis-16.56, 15.08, X-O.337, 0.334,Y- 0.337, 0.337, λd-582nm, 563 nm, Pe-0.021, 0.013.Chemical analysis gave V2O5-44.75, V204-26.11, Fe203-28.79, and trace minor amounts of Ti02, A12O3 SiO2 totalling 1o1.74. Approximate formula; V5.90Fe2.64O18.

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巫声扬,王德生,1986,我国首次发现的铁钒矿(Nolanite)[J].岩石矿物学杂志,5(1):68~74.,1986,First Occurrence of Nolanite in China[J]. Acta Petrologica et Mineralogica,5(1):68~74.

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