Atom positions: Ca in 6 (b): 0, 0, 0
C in 6 (a): 0, 0, 1/4
O in 18(e): x, 0, 1/4 where x = 0.2568
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from "Carbonates: Mineralogy and Chemistry," Reviews in Mineralogy, Vol.
11, p.8, published by The Mineralogical Society of America, 1990.
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Sincerely,
Dr. A. Cuneyt Tas
Dept. of Metallurgical and Materials Engineering
Middle East Technical University
Ankara 06531, Turkey