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[[Lava]] or other [[volcano|volcanic]] material that is heavily pitted with hollows and empty cavities.
[[Lava]] or other [[volcano|volcanic]] material that is heavily pitted with hollows and empty cavities.
Pellant, p. 251
Pellant, p. 251
=Sources=
=Sources=
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
[[category:geology]]
[[Category:Geology]]