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- W2129343031 abstract "Abstract The composition of Rhassoul clay is controversial regarding the nature of the pure-mineral clay fraction which is claimed to be stevensite rather than saponite. In this study, the raw and mineral fractions were characterized using various techniques including Fourier transform infrared spectroscopy and magic angle spinning nuclear magnetic resonance (MAS NMR). The isolated fine clay mineral fraction contained a larger amount of Al (>1 wt.%) than that reported for other stevensite occurrences. The 27 Al MAS NMR technique confirmed that the mineral is stevensite in which the Al is equally split between the tetrahedral and octahedral coordination sites. The 29 Si NMR spectrum showed a single unresolved resonance indicating little or no short-range ordering of silicon. The chemical composition of the stevensite from Jbel Rhassoul was determined to be ((Na 0.25 K 0.20 )(Mg 5.04 Al 0.37 Fe 0.20 ☐ 0.21 ) 5.61 (Si 7.76 Al 0.24 ) 8 O 20 (OH) 4 ). This formula differs from previous compositions described from this locality and shows it to be an Al-bearing lacustrine clay mineral." @default.
- W2129343031 created "2016-06-24" @default.
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- W2129343031 date "2008-09-01" @default.
- W2129343031 modified "2023-10-18" @default.
- W2129343031 title "Elucidating the crystal-chemistry of Jbel Rhassoul stevensite (Morocco) by advanced analytical techniques" @default.
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- W2129343031 doi "https://doi.org/10.1180/claymin.2008.043.3.05" @default.
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