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crystal data
Sodium calcium sulphate [Na4Ca(SO4)3] crystallizes with a hexagonal (rhombohedral) unit cell, a = 15.737 (3), c = 22.388 (4) Å; Z = 18; Dx = 2.616 g cm-3, DM = 2.62 g cm-3 . An indexed powder pattern and IR absorption data are given.