Nacrite Crystallography

Composition

Al2Si2O5(OH)4

Classification

1:1 Phyllosilicate, Kaolin Group

Structural parameters

a=8.906, b=5.146, c=15.664 Å
alpha=90, beta=113.58, gamma=90°
Space group: Cc

atom

x/a

y/b

z/c
Al1 0.1552 0.3198 0.2177
Al2 0.4901 0.3245 0.2173
Si1 0.2012 0.4700 0.0277
Si2 0.3715 0.9831 0.0270
O1 0.2411 0.7499 -0.0041
O2 0.2723 0.2470 0.0188
O3 0.0029 0.4417 -0.0193
O4 0.2696 0.4385 0.1385
O5 0.4618 0.0110 0.1381
O6 0.0795 0.0118 0.1432
O7 0.5580 0.6342 0.2838
O8 0.1780 0.6296 0.2825
O9 0.3693 0.2066 0.2826
H1 0.6346 0.4510 0.1277
H2 0.5475 0.6736 0.3279
H3 0.4317 0.1386 0.3228

Reference

Zheng, H., and S.W. Bailey. 1994. Refinement of the Nacrite Structure. Clays and Clay Minerals. 42(1):46-52.

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Original release: 1 Oct 1998;