JamieAndisols are small hats made of andesite rocks wore by volcanologists in tropical areas. Perhaps you refer to andosol (also called andepts), a black or brown soil that is formed from volcanic material. Steve Mattox Source of Information: Bates, R.L., and Jackson, J.A., 1987, Glossary of geology: American Geological Institute, Alexandria, Virginia, 788 p.
Sincerely,
Steve Mattox
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