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[[Gas]]-bubble [[cavity]] in [[lava]], left as a hole after the lava solidifies.
Pellant, p. 251
=Sources=
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
[[category:geology]]
Pellant, p. 251
=Sources=
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
[[category:geology]]