lithophysa

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lithophysa

[‚lith·ə′fīs·ə]
(geology)
A large spherulitic hollow or bubble in glassy basalts and certain rhyolites. Also known as stone bubble.
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Yellow needles of the oxide to about 1 mm long also occur in lithophysae associated with hematite at a location southwest of Pismire Knolls.
Specimens of rhyolite containing lithophysae that have the mineral present must be handled gently because the needles have a tendency to break off if the host specimen is sharply jostled or struck.
Plates and tablets of cochineal-red to blood-red niobian rutile as much as 4 mm across and 1 mm thick occur in the lithophysae within and adjacent to the fracture zone.