Willemite

O₄SiZn₂

Klaska, K.-H.Eck, J. C.Pohl, D.

Acta Crystallographica, Section B (1978) 34, 3324-3325

a=13.948Å   b=13.948Å   c=9.315Å

α=90°   β=90°   γ=120°