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Abstract
Ikaite, CaCO3 · 6H2O, is monoclinic, C2/c, with a = 8.792(2), b = 8.310(2), c = 11.021(2) Å, β = 110.53(5)°, Z = 4. With 2205 independent reflections taken at −25°C of a naturally grown crystal specimen the structure was refined to a weighted Rw = 0.028. The CO3 group is planar with C – O distances 1.279(2) and 1.290(1) (2 ×) Å. The hydrogen bond network is determined. The optical behaviour is explained by structural characteristics.
Published Online: 2010-8-25
Published in Print: 1983-2-1
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