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[en] 57Fe Mössbauer spectra of NAu-2 nontronite show a quadrupole split spectrum with no trace of magnetic ordering down to 5 K. Two quadrupole doublets are due to octahedral cis Fe3+ and one to tetrahedral Fe3+. However, the fourth doublet, with a splitting of 1.28 mm/s is attributed to a new Fe3+ species, possibly in a ditrigonal cavity or a polyoxocation species in the interlayer.
Source
Micolich, Adam (ed.); Australian Institute of Physics, East Melbourne, VIC (Australia); 85 p; ISBN 978-0-646-55969-8; 
; 28 Jun 2011; p. 34-37; 35. annual condensed matter and materials meeting; Wagga Wagga, NSW (Australia); 1-4 Feb 2011; Available online from: http://aip.org.au/annual-cmm-meetings/; Also available online from: http://www.aip.org.au/wp-content/uploads/cmm/2011/cmm111.pdf; 1 fig., 1 tab., 1 refs.
; 28 Jun 2011; p. 34-37; 35. annual condensed matter and materials meeting; Wagga Wagga, NSW (Australia); 1-4 Feb 2011; Available online from: http://aip.org.au/annual-cmm-meetings/; Also available online from: http://www.aip.org.au/wp-content/uploads/cmm/2011/cmm111.pdf; 1 fig., 1 tab., 1 refs.