lithophysa

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lithophysa

(ˌlɪθəʊˈfaɪsə) or

lithophyse

n
(Minerals) a cavity or hollow found in volcanic rocks, caused by expanding gas
References in periodicals archive ?
Note the presence of orange colored oxides on the outer matrix and the formation of lithophysae with translucent crystals within the vesicles.
Observe the presence of pyrite on the surface of the grain and white radial zeolites forming lithophysae in the vesicles.
The occurrence of this new oxide at the discovery location [ILLUSTRATION FOR FIGURE 2 OMITTED] is restricted to lithophysae within rhyolite along two intersecting, steeply dipping fracture zones, one trending north-northeast and the other north-northwest.