(Redirected from Lithophysae)A 'lithophysa' (plural 'lithophysae') is a small cavity found in
felsic volcanic rocks believed to be caused by expanding gases in
tuffs before solidification. If it has become lined with
crystals it may be referred to as a
geode or a
thunderegg. The word lithophysae is from the
Latin for ''rock bubble''. The term
vug is also used for similar cavities although vug is usually restricted to mean cavities in rocks formed by the removal of material such as soluble minerals.
External links
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lithophysae cluster image
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What Are Lithophysae?
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