1. It is a synonym for the smectite clay : stevensite. 2. The mineral smectite ( a phyllosilicate ) forms in near-neutral waters. 3. Literature articles will refer to a R1 ordered illite-smectite , for example. 4. The bundles are surrounded by a matrix of smectite clays that are slightly swellable. 5. The alunite-jarosite found in the smectite rind would have a similar origin. 6. The common clay minerals are montmorillonite or smectite , illite, and kaolinite or kaolin. 7. The rock is altered by water to smectite and kaolinite with quartz being left unaltered. 8. R1 ordered chlorite-smectite is known as corrensite, R1 illite-smectite is rectorite. 9. R1 ordered chlorite-smectite is known as corrensite, R1 illite-smectite is rectorite. 10. Scientists experimented with adding bentonite, one of the smectite family of clays, to the soil.