Segregation and cation-ordering in sj6grenite and pyroaurite
نویسنده
چکیده
A specimen from L~tngban, Sweden, was found to consist largely of sj6grenite in which segregation and ordering of the metal cations had occurred, yielding an intergrowth of regions of two main types with compositions probably of or near Mg2/3Fel/3(OH)2(COa)I/6(H~O)o.~ and Mg12/13Fel/~3(OH)2(CO3)~/~6(H~O)0.8. To a smaller extent segregation had proceeded further, giving regions probably approximating to the end-member Mg(OH)2.H20. It is suggested that the names sj6grenite and pyroaurite be used for the 2Hand 3Rpolytypes of this structure irrespective of Mg: Fe ratio, segregation, or cation ordering.
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