- Mckelveyite
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Mckelveyite General Category Mineral Chemical formula Ba3Na(Ca,U)Y(CO3)6 · 3H2O Strunz classification 05.CC.05 Identification Molar mass 1,027.54 g/mol Color Yellow, black, gray–greenish gray, white Crystal habit Tabular, pyramidal Crystal system Triclinic pinacoidal Cleavage Indistinct Mohs scale hardness 3.5–4 Luster Vitreous, greasy, or dull Streak White Diaphaneity Transparent to opaque Specific gravity 3.25 Optical properties Biaxial (-) Refractive index nα = 1.550–1.554 nβ = 1.550–1.554 nγ = 1.649–1.658 Birefringence δ = 0.0990–0.1040 References [1][2] Mckelveyite is a hydrated sodium, barium, yttrium, and uranium–containing carbonate, with the chemical formula Ba3Na(Ca,U)Y(CO3)6 · 3H2O.[1][2] It was first described in 1965 from deposits in the Green River Formation, Sweetwater County, Wyoming, and is named after Vincent Ellis McKelvey (1916–1985), a former director of the United States Geological Survey.[3]
See also
References
- ^ a b Anthony, John W.; Richard A. Bideaux, Kenneth W. Bladh, and Monte C. Nichols (1995). Handbook of Mineralogy. Tucson, Arizona: Mineral Data Publishing. ISBN 978-0-9622097-1-0. http://www.handbookofmineralogy.org/pdfs/mckelveyitey.pdf.
- ^ a b "Mckelveyite-(Y)". webmineral.com. http://webmineral.com/data/Mckelveyite-(Y).shtml. Retrieved 2008-12-13.
- ^ Milton, C.; B. Ingram, J.R. Clark, and E.J. Dwornik (1965). "Mckelveyite, a new hydrous sodium barium rare-earth uranium carbonate mineral from the Green River Formation, Wyoming.". Amer. Mineral. 50: 593–612. http://www.minsocam.org/ammin/AM50/AM50_593.pdf.
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