
%0 Journal Article
%A Hyde, B 
%A Mclaren, A 
%T The Crystal Chemistry of Moganite and Amethyst
%J Australian Journal of Chemistry
%D 1996/08/01
%V 49
%N 8
%P 861-866
%K 
%R https://doi.org/10.1071/CH9960861
%U https://www.publish.csiro.au/paper/CH9960861 
%X The crystal structure of moganite , SiO2, is described, analysed, and shown to be (mimetic) Brazil-twinned &#945;-quartz: it consists of {1101} layers of the latter, one tetrahedron thick, coherently joined at composition planes, with left- and right-handed quartz layers alternating. The structure of the region immediately adjacent to a composition plane is identical to that found in macroscopically twinned quartz, e.g. in amethyst. Thus the 'defect' structure in the latter is the total structure of the former-a classic example of Wadsley's idea that, in crystals, 'defects' are stable structural entities. 
