Pyrophyllite Crystallography

Composition

Al2Si4O10(OH)2

Classification

2:1 Phyllosilicate, Talc and Pyrophyllite Group

Structural Parameters

a=5.1614, b=8.9576, c=9.3511Å
alpha=91.03,beta=100.37, gamma=89.75º
Space Group: C-1

atom

x/a

y/b

z/c
Al 0.5 0.167 0
Si1 0.748 0 0.289
Si2 0.759 0.331 0.289
O1 0.671 0.004 0.113
O2 0.721 0.319 0.113
OH 0.221 0.186 0.113
Ob1 0.055 0.387 0.353
Ob2 0.724 0.167 0.353
Ob3 0.550 0.448 0.336

Reference

Wardle, R., and G.W. Brindley. 1972. The crystal structures of pyrophyllite, 1Tc, and of its dehydroxylate. American Mineralogist. 57:732-750.

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Original release: 1 Oct 1998;