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Nordstrandite in Bauxite Derived from Phonolite, Lages, Santa Catarina, Brazil
Bauxite Boehmite Gibbsite Nordstrandite Paraná Basin Phonolite Weathering
2011/12/5
Abstract: Nordstrandite from Lages represents the first occurrence of this mineral in an oxisoil that does not involve the influence of a calcareous substrate. This is also the first reported occurren...
Crystal structure of kanemite, NaHSi2O5·3H2O, from the Aris phonolite, Namibia
single-crystal X-ray diffraction kanemite NaHSi2O5·3H2O
2012/3/31
Kanemite was studied by single-crystal X-ray diffraction. The mineral, ideally NaHSi O °§3 O,2 5 2
is orthorhombic (space group Pbcn); unit-cell parameters are a = 4.946(3), b = 20.502(15), c = 7.275...