Nontronite Manceau A, Chateigner D, Gates W P Physics and Chemistry of Minerals 25 (1998) 347-365 Polarized EXAFS, distance-valence least-squares modelling (DVLS), and quantitative texture analysis approaches to the structural refinement of Garfield nontronite _database_code_amcsd 0008146 5.277 9.14 9.78 90 101.0 90 C2/m atom x y z occ Na .5 0 .5 .5 Fe 0 .667 0 Si .431 .328 .288 .866 Al .431 .328 .288 .134 O1 .364 .313 .115 O2 .489 .5 .330 O3 .186 .731 .353 OH4 .396 0 .115