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Barium sulfate precipitates in a form of rectangular perfect crystal from a solution of low initial concentration, and in a form of dendrite from a solution of higher initial concentration. They are platelets grown along (100) plane. The short- and long-axes of rectangular crystal are b- and c-axes respectively. The dendrite grows along b- and c-axes, or along the direction perpendicular to the plane of {011} group.
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Kazuyoshi Takiyama (1959) studied this question.
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