Bentonites

Bentonite, mineralogical data

`Minerals`	`Content`
`Smectite`	`80-90%`
`Illite`	`>1%`
`Chlorite`	`---`
`Kaolinite`	`---`
`Calcite`	`1%`
`Feldspar`	`1-4%`
`Carbonates`	`1%`
`other`	`2-3%`

Mineral composition of greek bentonite
from: Baier, J.; Griechischer Bentonit für Giessereien, Giesserei 78 (1991), Nr. 14, S. 502

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