| The clay is composed of illite and kaolinite, with minor amounts of chlorite and smectite. |
| Smectite and illite, with occasional small amounts of kaolinite, occur in mollisols, which are prairie chernozem soils. |
| Sandstones with this component contain authigenic hematite intergrown with kaolinite and illite and replacing muscovite. |
| Clay minerals are mainly illite and chlorite, with only traces of smectite, vermiculite and kaolinite. |
| However, in 30 years, nothing about our illite green clay has changed, and it goes on being extracted from the same quarry! |
| The clay minerals illite, chlorite and montmorillonite were identified within the palaeosols by X-ray diffraction. |
