Aragonite Crystallography

Composition

CaCO3

Classification

Carbonate

Structural parameters

a=4.9616, b=7.9705, c=5.7394 Å
alpha=90, beta=90, gamma=90 °
Space Group: Pmcn

atom

x/a

y/b

z/c
Ca 0.25 0.4151 0.2403
C 0.25 0.7627 0.085
O 0.25 0.9231 0.0952
O 0.4729 0.6801 0.087

Reference

Dal Negro, A., and L. Ungaretti. 1971. Refinement of the crystal structure of aragonite.American Mineralogist 56:768-772.

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Original release: 1 Oct 1998;