期刊
MINERALS
卷 8, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/min8110511
关键词
new mineral; uranyl carbonate; crystal structure; complexity; paddle
资金
- Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-FG02-07ER15880]
- John Jago Trelawney Endowment
- Ministry of Education, Youth and Sports National sustainability program I of the Czech Republic [LO1603]
Paddlewheelite, MgCa5Cu2[(UO2)(CO3)(3)](4)center dot 33H(2)O, is a new uranyl carbonate mineral found underground in the Svornost mine, Jachymov District, Bohemia, Czech Republic, where it occurs as a secondary oxidation product of uraninite. The conditions leading to its crystallization are complex, likely requiring concomitant dissolution of uraninite, calcite, dolomite, chalcopyrite, and andersonite. Paddlewheelite is named after its distinctive structure, which consists of paddle-wheel clusters of uranyl tricarbonate units bound by square pyramidal copper axles and a cubic calcium cation gearbox. Paddle wheels share edges with calcium polyhedra to form open sheets that are held together solely by hydrogen bonding interactions. The new mineral is monoclinic, Pc, a = 22.052(4), b = 17.118(3), c = 19.354(3) angstrom, beta = 90.474(2)degrees, V = 7306(2) angstrom(3) and Z = 4. Paddlewheelite is the second-most structurally complex uranyl carbonate mineral known after ewingite and its structure may provide insights into the insufficiently described mineral voglite, as well as Cu-U-CO3 equilibrium in general.
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