Dickite Cystallography

Classification

1:1 Dioctahedral Phyllosilicate

Composition

Al2Si2O5(OH)4

Structural parameters

a=5.1474, b=8.9386, c=14.390 Å
alpha=90, beta=96.483, gamma=90°
Space Group: Cc

atom

x/a

y/b

z/c
Si1 0.0126 0.3992 0.0398
Si2 0.997 0.0692 0.0403
Al1 0.9127 0.2489 0.2283
Al2 0.4133 0.4149 0.2276
O1 0.9550 0.2352 0.9938
O2 0.2577 0.4695 0.9932
O3 0.7663 0.5054 0.0086
O4 0.0786 0.3880 0.1516
O5 0.0052 0.0790 0.1564
O6 0.5814 0.2722 0.1564
O7 0.2442 0.2761 0.2976
O8 0.2447 0.8914 0.2990
O9 0.3191 0.5813 0.2974
H1 0.4795 0.1848 0.1549
H2 0.2957 0.2558 0.3627
H3 0.3260 0.9456 0.3515
H4 0.2891 0.5813 0.3605

Reference

Bish, D.L., and C.T. Johnston, 1993. Rietveld Refinement and Fourier-Transform Infrared Spectroscopic Study of the Dickite Structure at Low Temperature. Clays and Clay Minerals. 41:297-304.

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Original release: 1 Oct 1998;