Alpha-Quartz Crystallography

Composition

SiO2

Classification

Tectosilicate

Structural Parameters

a=4.916, b=4.916, c=5.4054 Å
alpha=90, beta=90, gamma=120°
Space Group: *P3_221

atom

x/a

y/b

z/c
Si1 0.4697 0.0 0.0
O1 0.4135 0.2669 0.1191

Reference

Levien, L., C.T. Prewitt, and D. J. Weidner. 1908. Structure and elastic properties of quartz at pressure P=1 atm. American Mineralogist. 65:920-930

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Original release: 1 Oct 1998;