lithophysae

GLOSSARY OF VOLCANIC TERMS
Radial aggregates of fibrous crystals which have formed around an expanding vesicle in a melt which is capable of flowing (Cas and Wright, 1987, p. 84). Lithophysae are commonly the result of vapor-phase crystallization within a rhyolitic magma. They should not be confused with spherulites, which are similar-shaped structures formed from devitrification of volcanic glass.

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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