The unit cell constants and the space group of childrenite, AlPO4 · Fe(OH)2 · 2H2O, have been determined by the Buerger precession method with the following results: a = 10.38 Å, b = 13.36 Å c = 6.911 Å a:b:c=0.7766:1:0.5173; Z = 8; calculated density = 3.186 g./cc.; space group Bba2.

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