°C.) has the following constitution.(Henry, Kirby & Shaw, 1945).Good crystals, obtained from the specimen as supplied, were in the form of cream-coloured plates with (100) prominent and ( 001) and ( 101) also present.A full survey of the reciprocal lattice, using a stationaryfilm single-crystal camera and Cu Ka radiation, gave the results listed below.The density was measured by flotation.
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G. S. D. King (1962) studied this question.