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Halloysite clay minerals are ubiquitous in soils and weathered rocks where they occur in a variety of particle shapes and hydration states. When both halloysite and kaolinite are present in a given sample, differentiation between the two minerals is problematic particularly when the halloysite constituent is dehydrated. Formamide intercalation test is widely used to differentiate halloysite-(7 Å)...
Volcanic ash soils are usually associated within the weathering sequence glass->allophane->halloysite. On the eastern slopes of the volcano La Soufriere, Guadeloupe, this sequence occurs in a toposequence Molli-silicic Andosol-Humic Andosol-Haplic Andosol-Haplic Nitisol, where the average annual rainfall decreases from 4000 mm at 420 m a.s.l. to 2500 mm at 30 m a.s.l. Of this sequence, we selected...
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