Structure
Two common forms are found, when hydrated the clay exhibits a 1 nm spacing of the layers and when dehydrated (meta-halloysite) the spacing is 0.7 nm. Halloysite naturally occurs as small cylinders which average 30 nm in diameter with lengths between 0.5 and 10 micrometres. The cation exchange capacity depends on the amount of hydration, as 2H2O has 5-10 m.e/100g, while 4H2O has 40-50 m.e./100g. "Endellite" is the alternative name for the 4H2O structure.
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