The unit cell constants and the space group of probertite, Na2O · 2CaO · 5B2O3 · 10H2O, have been determined by the Buerger precession method with the following results: a = 13.88 Å b = 12.56 Å c = 6.609 Å β = 107°40'; a: b: c = 1.1053:1:0.5263; Z=2; calculated density = 2.126 g./cc.; space group P21/n.

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