Beryl Crystallography

Composition

Be3Al2(SiO3)6

Classification

Six-Member Ring Cyclosilicate

Structural parameters

a=9.218, b=9.218, c=9.197 Å
alpha=90, beta=90, gamma=120°
Space Group P6/mcc (192) symmetry 1

atom

x

y

z
Si 0.3873 0.1156 0.0000
Be 0.5000 0.0000 0.2500
Al 0.6667 0.3333 0.2500
Fe 0.6667 0.3333 0.2500
O1 0.3099 0.2365 0.0000
O2 0.4986 0.1454 0.1452
OH3 0.0000 0.0000 0.2500

Reference

Artioli, G., R. Rinaldi, K. Stahl, and P.F. Zanazzi. 1993. Structure refinements of beryl by single-crystal neutron and X-ray diffraction. American Mineralogist. 78:762-768

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Original release: 1 Oct 1998;