Ana P. Carvalho, Angela Martins, Joao M. Silva, Joao Pires, Helena Vasques and M. Brotas De Carvalho. Characterization of the Acidity of Al-And Zr-Pillared Clays P. Adamo, M. Pigna, S

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Ana P. Carvalho, Angela Martins, Joao M. Silva, Joao Pires, Helena Vasques and M. Brotas De Carvalho. Characterization of the Acidity of Al-And Zr-Pillared Clays P. Adamo, M. Pigna, S

FORTHCOMING PAPERS The following are some papers that have been accepted for publication in future issues of Clays and Clay Minerals: Victoria C. Hover and Gail M. Ashley. reflectance spectrum in relation to the color and Geochemical signatures of paleodepositional crystal properties of hematite and diagenetic environments: a STEM/AEM Basil Hubbard, Wenxing Kuang, Arvin Moser, study of authigenic clay minerals from an arid Glenn A. Facey and Christian Detellier. rift basin, Olduvai Gorge, Tanzania Structural study of Maya Blue: textural, ther- Christopher Q. Kautz and Peter C. Ryan. The 10 AÊ mal, and solid-state multinuclear magnetic to 7 AÊ halloysite transition in a tropical soil resonance characterization of the palygorksite- sequence, Costa Rica indigo and sepiolite-indigo adducts Aldo Mirabella and Markus Egli. Structural George E. Christidis and Sortiria Kosiari. transformations of clay minerals in soils of a Decolorization of vegetable oils: a study of climosequence in an Italian Alpine environment the mechanism of adsorption of b-carotene by Aydogán Akbulut and Selahattin Kadir. The geology an acid-activated bentonite from Cyprus and origin of sepiolite, palygorskite and saponite Hadar Heller and Rami Keren. Anionic polyacry- in Neogene lacustrine sediments of the Serinhisar- lamide polymer adsorption by pyrophyllite and Acipayam Basin, Denizli, SW Turkey montmorillonite Chao Shang, James A. Rice, Dennis D. Eberl and Ana P. Carvalho, Angela Martins, Joaõ M. Silva, Jar-Shyong Lin. Measurement of the illite Joaõ Pires, Helena Vasques and M. Brotas de particle thickness using a direct Fourier trans- Carvalho. Characterization of the acidity of Al- form of small-angle X-ray scattering data and Zr-pillared clays Maria Franca Brigatti, Enrico Caprilli, Marco P. Adamo, M. Pigna, S. Vingiani and A. Violante. Marchesini and Luciano Poppi. The crystal A peculiar morphology of gibbsite and nord- structure of roscoelite-1M strandite co-crystallized in the presence of Jose´Torrent and Vidal Barroń. The visible diffuse tartrate in a strongly alkaline environment Copyright # 2003, The Clay Minerals Society 228.

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Roscoelite K(V ; Al; Mg)2Alsi3o10(OH)2 C 2001 Mineral Data Publishing, Version 1.2 ° Crystal Data: Monoclinic
3+ Roscoelite K(V ; Al; Mg)2AlSi3O10(OH)2 c 2001 Mineral Data Publishing, version 1.2 ° Crystal Data: Monoclinic. Point Group: 2=m: As minute scales, in druses, rosettes, or fan-shaped groups; ¯brous and in felted aggregates; as impregnations, massive. Physical Properties: Cleavage: Perfect on 001 . Hardness = Soft. D(meas.) = 2.92{2.94 D(calc.) = [2.89] f g Optical Properties: Transparent to translucent. Color: Dark clove-brown, greenish brown to dark greenish brown. Luster: Pearly. Optical Class: Biaxial ({). Pleochroism: X = green-brown; Y = Z = olive-green. ® = 1.59{1.610 ¯ = 1.63{1.685 ° = 1.64{1.704 2V(meas.) = 24.5±{39.5± Cell Data: Space Group: C2=c: a = 5.26 b = 9.09 c = 10.25 ¯ = 101:0± Z = 2 X-ray Powder Pattern: Paradox Valley, Colorado, USA. 10.0 (100), 4.54 (80), 3.35 (80), 2.60 (80), 1.52 (60), 3.66 (50), 3.11 (50) Chemistry: (1) SiO2 47.82 Al2O3 12.60 V2O5 19.94 FeO 3.30 MgO 2.43 CaO trace Na2O 0.33 K2O 8.03 + H2O 5.13 Total 99.58 (1) Stuckslager mine, California, USA. Polymorphism & Series: Forms a series with muscovite; 1M polytype. Mineral Group: Mica group. Occurrence: An early-stage gangue mineral in low-temperature epithermal Au-Ag-Te deposits; from the oxidized portions of low-temperature sedimentary U-V ores. Association: Quartz, pyrite, carbonates, °uorite, gold (Au-Ag-Te mineral association); corvusite, hewettite, carnotite, tyuyamunite (U-V mineral association). Distribution: In the USA, from the Stuckslager mine, Lotus, El Dorado Co., California; in Colorado, from Cripple Creek, Teller Co., La Plata district, La Plata Co., Magnolia district, Boulder Co., the Gateway district, Mesa Co., in the Uravan and Paradox, Bull Canyon, and Slick Rock districts, in Montrose, San Miguel, and Dolores Cos.
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