Abstract
Abstract 1) The hexagonal plate crystals of the brucite, about 1 μ across, have been obtained by the hydrothermal treatment of chemicallypure magnesium hydroxide. 2) The brucite crystals transformed themselves upon dehydration into aggregates of the minute periclase crystallites oriented in such a way that (111) is parallel with (0001) of the original brucite crystal and (220) is parallel with (11\={20}). 3) The dehydration seems to take place in two steps. The escape of water molecules and the gradual shrinkage of the lattice take place at the first step of the dehydration. The slip of the oxygen layers and the crystallization take place at the second step. 4) Upon further heating after complete dehydration, the orientation of the crystallites remained unchanged in many crystals. In a few crystals, however, the orientation changed in the several ways shown in Table I. This phenomenon is a kind of sintering in the grain.
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