抄録
An imnrovement in the “crystallinity” of an industrially synthesized Nafluortaeniolite was performed by hydrothermal annealing with pure water or NaOH solutions. The temperatures and pressure applied were 300, 450 and 600°C, and 100MPa, respectively. The run duration was 7 days. By hydrothermal annealing, the particles of Na-fluortaeniolite less than about 21Lm disappeared and others grew to have the euhedral shape common to micas. The improvements in the size, form and perfection of crystals resulted from a pure water treatments, especially that at 600°C. The hydrothermal annealing with NaOH solution showed a similar effect but produced some second phases.
