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stone bubble
geology
Also known as: lithophysa
Learn about this topic in these articles:
occurrence in igneous rocks
- In igneous rock: Small-scale structural features
Lithophysae, also known as stone bubbles, consist of concentric shells of finely crystalline alkali feldspar separated by empty spaces; thus, they resemble an onion or a newly blooming rose. Commonly associated with spherulites in glassy and partly crystalline volcanic rocks of salic composition, many lithophysae are about the size…
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type of spherulite
- In spherulite
Lithophysae are hollow, bubble-like or rose-like forms that occur within certain glassy rocks. They consist of concentric shells with hollow interspaces. Many are penetrated by parallel membranes, which are continuations of laminations in the enclosing rock. The shells may be lined with delicate crystals of…
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