Abstract
Botryoidal psilomelane from the Tower Mine Area, New Mexico, exhibits normal “collo-form” banding and distinct radial structure. The outer bands consist of flexible elastic psilomelane fibers elongated along the b axis and oriented parallel with the radial structure. A possible growth mechanism involves crystal growth from dilute solutions. Continuing fiber growth results in a dense mass which forms the “colloform” bands exhibiting radial structure on broken surfaces.
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