The crystal structure of calcium chloride tetrahydrate was determined by use of three-dimensional X-ray diffractometer data. Crystals of CaCI2.4H20 are triclinic, space group P], with a= 6.593 (2), b=6.364(5), c=8.557(3) /~, ~=97-77(5), fl=93.52(4), and y=110.56 (3) °. The structure was refined by least-squares calculations to R=0.085. The two chloride ions and four water molecules form a trigonal prismatic coordination polyhedron about the calcium ion.
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