Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of pearlstone is as below...

Pearlstone :: Pearlstone (n.) A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under Perlitic..

Spherulite :: Spherulite (n.) A minute spherical crystalline body having a radiated structure, observed in some vitreous volcanic rocks, as obsidian and pearlstone..

Perlitic :: Perlitic (a.) Relating to or resembling perlite, or pearlstone; as, the perlitic structure of certain rocks. See Pearlite..

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