Fluorapatite Crystallography

Composition

Ca5(PO4)3F

Classification

Phosphate

Structural Parameters

a=9.397, b=9.397, c=6.878 Å
alpha=90, beta=90, gamma=120°
Space Group: P6_3/m

atom

x/a

y/b

z/c
Ca 0.66670 0.3333 0.0010
Ca -0.0071 0.2423 0.2500
P 0.36900 0.3985 0.2500
O 0.48490 0.3273 0.2500
O 0.46670 0.5875 0.2500
O 0.25750 0.13421 0.0705
F,Cl 0.0000 0.0000 0.2500

Reference

Hughes, J.M., M. Cameron, K.D. Crowley. 1989. Structural variations in natural F, OH, and Cl apatites. American Mineralogist. 74:870-876.

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Original release: 1 Oct 1998;