Calcite Crystallography

Composition

CaCO3

Classification

Carbonate

Structural parameters

a=4.9900, b=4.9900, c=17.0615 Å
alpha=90, beta=90, gamma=120°
Space Group: R-3c

atom

x/a

y/b

z/c
Ca 0 0 0
C 0 0 0.25
O 0.2578 0 0.25

Reference

Graf, D. L. 1961. Crystallographic tables for the rhombohedral carbonates. American Mineralogist. 46:1283-1316

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Original release: 1 Oct 1998;