Leószilárdite, the first Na,Mg-containing uranyl carbonate from the Markey Mine, San Juan County, Utah, USA
| Autor: | Peter C. Burns, Joe Marty, Luke R. Sadergaski, Ian Steele, Jakub Plášil, Owen P. Mills, Travis A. Olds, Anthony R. Kampf, Shawn M. Carlson |
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| Rok vydání: | 2017 |
| Předmět: |
Crystal structure
010502 geochemistry & geophysics 010403 inorganic & nuclear chemistry Tricarbonate Uranyl 01 natural sciences Uranyl carbonate 0104 chemical sciences chemistry.chemical_compound Crystallography chemistry Geochemistry and Petrology Ultraviolet light Pleochroism Andersonite 0105 earth and related environmental sciences Monoclinic crystal system |
| Zdroj: | Mineralogical Magazine. 81:1039-1050 |
| ISSN: | 1471-8022 0026-461X |
| DOI: | 10.1180/minmag.2016.080.149 |
| Popis: | Leószilárdite (IMA2015-128), Na6Mg(UO2)2(CO3)6·6H2O, was found in the Markey Mine, Red Canyon, White Canyon District, San Juan County, Utah, USA, in areas with abundant andersonite, natrozippeite, gypsum, anhydrite, and probable hydromagnesite along with other secondary uranium minerals bayleyite, čejkaite and johannite. The new mineral occurs as aggregates of pale yellow bladed crystals flattened on ﹛001﹜ and elongated along [010], individually reaching up to 0.2 mmlong. More commonly it occurs as pale yellow pearlescent masses to 2 mm consisting of very small plates. Leószilárdite fluoresces green under both longwave and shortwave ultraviolet light, and is translucent with a white streak, hardness of 2 (Mohs), and brittle tenacity with uneven fracture. The new mineral is readily soluble in room temperature H2O. Crystals have perfect cleavage along ﹛001﹜, and exhibit the forms ﹛110﹜,﹛001﹜,﹛100﹜,﹛101﹜ and ﹛101﹜. Optically, leószilárdite is biaxial (-), α= 1.504(1), β= 1.597(1), γ= 1.628(1) (white light); 2V (meas.) = 57(1)°, 2V (calc.) = 57.1°; dispersion r > v, slight. Pleochroism: X= colourless, Y and Z= light yellow; X |
| Databáze: | OpenAIRE |
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