An Introduction to Environmental Chemistry

90 Chapter Four

OH

OH

OH

OH

1.2 nm

6 O

Hydrogen

bonding

6 [OH]

4 AI

4 O + 2[OH]

4 Si

6 O

OH OH OH OH

Fig. 4.9The structure of a 1 : 1 clay mineral (kaolinite).

Fig. 4.10Scanning electron microscope image of kaolinite showing plate-like crystals

arranged in stacks. Scale bar=1.36mm. Photograph courtesy of S. Bennett.