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Title
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Blatonite, UO2CO3 center dot H2O, a new uranyl carbonate monohydrate from San Juan County, Utah
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Author
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Abstract
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| Blatonite, ideally UO2CO3. H2O, is a new uranyl carbonate mineral found in the Jomac mine, Brown's Rim, San Juan County, Utah. It occurs in seams of gypsum located between some bedding planes of a layer of siltstones within the Triassic Shinarump conglomerate. Associated U6+ minerals are boltwoodite, coconinoite, metazeunerite, and rutherfordine, together with the Cu2+ minerals azurite, brochantite, carbonate-cyanotrichite and malachite. Blatonite occurs as acicular crystals that are canary yellow and translucent with a silky luster and colorless streak. It strongly fluoresces in UV. H-Mohs = 2-3. D-meas. = 4.05(2), D-calc. = 4.02 g/cm(3) (idealized formula). Optically uniaxial(+), omega 1.588(2), epsilon 1.612(2). The crystals are nonpleochroic. Blatonite is hexagonal or trigonal (space group unknown): a 15.79(1), c 23.93(3) Angstrom, V 5167(9) Angstrom(3) and Z = 36. The strongest reflections of the X-ray powder pattern [d(in Angstrom)(I)hkl] are: 7.86(47)110, 6.91(55)103, 6.56(77)201, 4.76(40)114, 4.34(36)213 and 3.06(100)207. Electron microprobe and thermogravimetric analyses gave UO3 81.98, CO2 12.82, H2O 5.38, total 100.18 wt %. The empirical formula is 0.988 UO2. 1.004 CO2. 1.029 H2O. The name honors the Belgian crystallographer Norbert Blaton, University of Leuven, Belgium. Holotype material is deposited in the mineralogical collection of the Royal Belgian Institute of Natural Sciences, Brussels, Belgium. |
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Language
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English
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Source (journal)
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Canadian mineralogist. - Toronto
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Publication
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Toronto
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1998
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ISSN
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0008-4476
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Volume/pages
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36
:Part 4
(1998)
, p. 1077-1081
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ISI
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000077607800014
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