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- W2161069759 abstract "Hedenbergitic pyroxene alters topotaxially to the smectite nontronite following loss of Ca, Mg, and some Si, oxidation of the ferrous iron, and hydration. One unit cell of nontronite forms pseudomorphically from lt/z unit cells of pyroxene with no volume change; the b axes in nontronite and pyroxene are parallel but cpy, equals a,ons so that droo for pyroxene becomes doo, for nontronite. The nucleation of nontronite proceeds from cracks, but firstformed domains, which are about 50 X 10 X 3 nm, are distributed homogeneously over small (micron) areas within the pyroxene. It is postulated that these domains form by a process similar to crystallographic shear. Silicon-ferric iron, tetrahedral-octahedral chains slip 7z[0l]o* to reconnect as'talc'layers after loss of Ca, Mg, Si, and O has left room for movement. The resulting clear, yellow, nontronite crystals are one-dimensionally disordered, and have composition (Ko.ouCaoro) (AloouFe!.+noMgo.ur)SisOro(O,OH)4'4.3 HrO." @default.
- W2161069759 created "2016-06-24" @default.
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- W2161069759 date "1975-01-01" @default.
- W2161069759 modified "2023-09-27" @default.
- W2161069759 title "Nontronite Topotaxial after Hedenbergite" @default.
- W2161069759 hasPublicationYear "1975" @default.
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