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• W2095672275 abstract "Pauflerite, β-VO(SO 4 ), is a new mineral species from the fumaroles of the Great Fissure Tolbachik eruption (GFTE), Kamchatka Peninsula, Russia. It was found in 1977 in the first cinder cone of the North breach of the GFTE. The mineral occurs as light green prismatic crystals up to 0.1 mm in length, associated with shcherbinaite (V 2 O 5 ), an unknown Tl–Bi sulfate and finely crystalline Mg, Al, Fe and Na sulfates. Pauflerite is light green with a white streak and vitreous luster; the mineral is transparent and non-fluorescent. The Mohs hardness is 3–4. Pauflerite is brittle, and without visible cleavage. The density is 3.36(4) (measured) and 3.294 g/cm 3 (calculated). The mineral is biaxial, optically positive, α 1.731(4), β 1.778(2), γ 1.845(4), with 2 V meas ≈ 90°, and 2 V calc equal to 83°. The orientation was determined as X = a ; further details are unclear. Pleochroism is clear in green tones: X light green, Y bluish green, Z light green-blue. A chemical analysis with an electron microprobe gave VO 2 50.40, SO 3 49.30, total 99.70 wt.%. The empirical formula, calculated on the basis of 5O, is V 0.99 S 1.01 O 5 . The simplified formula is VO(SO 4 ). Pauflerite is orthorhombic, Pnma , a 7.3890(13), b 6.2740(11), c 7.0788(11) A, V 328.16(10) A 3 , Z = 4. The structure has been solved by direct methods and refined to R 1 of 0.034, calculated for the 457 unique observed reflections (| F o | > 4σ| F o |). The structure contains one symmetrically independent V 4+ cation in distorted octahedral coordination to the O atoms (one vanadyl V 4+ –O bond of 1.607 A, four bonds of 1.992–1.996 A, and one bond of 2.267 A). One symmetrically independent S 6+ cation is tetrahedrally coordinated by four O 2− anions with the mean 6+ –O> bond length of 1.470 A. The structure of pauflerite consists of a three-dimensional framework of distorted V 4+ O 6 octahedra and SO 4 tetrahedra with a titanite-type topology. Pauflerite is a natural analog of β-VO(SO 4 ). The powder-diffraction pattern was not obtained because of the paucity of natural material. The calculated powder-diffraction pattern is in excellent agreement with that reported for the synthetic analogue (PDF 19–1400). The name chosen honors Peter Paufler, professor at the Technical University of Dresden in recognition of his important contributions to physical and structural crystallography and mineralogy." @default.
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• W2095672275 date "2007-08-01" @default.
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• W2095672275 title "PAUFLERITE, -VO(SO4), A NEW MINERAL SPECIES FROM THE TOLBACHIK VOLCANO, KAMCHATKA PENINSULA, RUSSIA" @default.
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• W2095672275 doi "https://doi.org/10.2113/gscanmin.45.4.921" @default.
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