Abstract

The unit cell dimensions of pyrobelonite have been remeasured using a Picker automatic diffractometer and Cu radiation. New data are: orthorhombic, Pnam, a = 7.644, b = 9.508, c = 6.182 Z; U = 449.3025 A 3 , F. W. = 1576.30; D x = 5.824 g ml (super -1) ; A = 4; D m = 5.82 g ml (super -1) . Dimensions previously reported are compared with remeasured values in a table. Indexed X-ray diffraction powder data with d values calculated on a computer are listed in a table.

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