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Typical Minerals
Volcanic Glass. Pumice has cooled too quickly for minerals to form. Chemical composition, however, will be from the bottom of Bowen's Reaction series (i.e. felsic).
     Pumice is a vesicular, foamy, very light weight, light colored rock formed by abundant, rapid gas escape during formation. It is often a pyroclastic product.
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Tectonic Association
     Pumice is found on continents, ejected from felsic volcanoes as pyroclastic material.
   Tectonic Cross Section - pdf version

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