T-O layer

The t-o layers are electrically neutral, and bonded to one another by weak Van der Waals bond or hydrogen bond. The basal spaeing (repeat distance from one layer to the next) is about 7 A. 

Minerals of kaolinite group are composed of successive arrangement of parallel layers. Eaeh layer contains one tetrahedral (t) and one octahedral (o) sheets of atoms and ions, therefore known as t-o layer. The t-o l ers of kaolinites are electrieally neutral, and bonded to one another by weak bond. 

---