Structural Data for Sudoite

Cheng-yi Lin1 and S. W. Bailey
Department of Geology and Geophysics, University of Wisconsin Madison, Wisconsin 53706
1 Present address: Center of Materials Analysis, Nanjing University, China.

Abstract: Single crystals of sudoite from Ottré, Belgium, allow confirmation of a dioctahedral 2:1 layer and a trioctahedral interlayer in a IIb arrangement. A regular 2-layer s structure is formed in which the octahedral stagger within both 2:1 layers is directed along X1 and adjacent layers are alternately displaced by a2/3 and a3/3. Poor quality crystals and twinning prevented three-dimensional refinement. One-dimensional refinement suggests that the smaller d(001) value of dioctahedral chlorites relative to trioctahedral species is due primarily to the thinner dioctahedral sheet.

Key Words: Chlorite • Crystal structure • Sudoite • Symmetry • Vermiculite

Clays and Clay Minerals; October 1985 v. 33; no. 5; p. 410-414; DOI: 10.1346/CCMN.1985.0330506
© 1985, The Clay Minerals Society
Clay Minerals Society (www.clays.org)