Abstract
Crystal structure / CaC03 .6 H20 Abstract.Ikaite, CaC03 . 6 H20, is monoclinic, C2jc, with a = 8.792(2), b= 8.310(2), c = 11.021(2)A, P = 110.53(5)°, Z = 4. With 2205 independent reflectionstaken at - 25°C of a naturally grown crystal specimen the structurewas refined to a weighted Rw = 0.028. The C03 group is planar with C- 0 distances 1.279(2) and 1.290(1) (2 x) A. The hydrogen bond network is determined.The optical behaviour is explained by structural characteristics.
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