Mixtures of analcime composition have been crystallized to analcime in the presence of water vapor and at a pressure of 15,000 p.s.i., and at temperatures of 200 degrees C. to 540 degrees C. Most of the runs were of 2 to 8 days' duration. No significant variations in the lattice parameter 2theta 400 -2theta 211 of analcime were observed.

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