Illite

Illite, chemical data

	`#1`	`#2`
`SiO₂`	`55.4`	`55.9`
`Al₂O₃`	`21.8`	`21.5`
`TiO₂`	`0.81`	`1.05`
`Fe₂O₃`	`7.0`	`6.9`
`MnO`		`0.03`
`MgO`	`3.7`	`4.2`
`CaO`	`1.2`	`1.3`
`Na₂O`	`0.38`	`0.41`
`K₂O`	`9.40`	`8.70`

Chemical data of illite in wt.-%
from: van Olphen, H.; Fripiat, J. J.; Data Handbook for Clay Minerals and other non-metallic Minerals. Pergamon Press, Oxford (1979)

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