FURTHER CONSIDERATION OF THE 29Si NUCLEAR MAGNETIC RESONANCE SPECTRUM OF KAOLINITE

-The introduction of artificial +b/3 stacking faults into well-crystallized kaolinite by intercalating and removing hydrazine had no observable effect on the solid-state 29Si nuclear magnetic resonance spectrum of kaolinite. Also, the introduction of such stacking faults did not alter the hydroxyl-stretching region of the infrared spectrum, implying no change in the hydrogen bonding between the displaced layers. Calculations of Si. . .H distances and Si-O...H angles from reported structures for kaolinite indicated that the resolution of the two Si chemical environments was due to differences in hydrogenbonding at the surface of the silicate sheet. Key Words--Hydrazine, Hydrogen bond, Kaolinite, Nuclear magnetic resonance, Stacking fault.