Abstract

Flinkite, Mn 2 Mn"'(AsO 4 )(OH) 4 is orthorhombic, space group Pnna (52), with a = 9.55, b = 13.11, c = 5.25 Aa, Z = 4 and calculated sp gr 3.37. Atelestite, Bi 8 (ASO 4 ) 3 O 5 (OH) 5 is monoclinic, space group P2 1 /a (14) with a = 10.88, b = 7.42, c = 6.89 Aa, beta = 107 degrees 13', Z = 1 and calculated sp gr 6.95.

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