
TY  - JOUR
A1  - Hyde, B 
A1  - Mclaren, A 
T1  - The Crystal Chemistry of Moganite and Amethyst
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1996
VL  - 49
IS  - 8
SP  - 861
EP  - 866
KW  - 
UR  - https://doi.org/10.1071/CH9960861 
N2  - 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. 
ER  -

