Bible Dictionaries
Pearlstone
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Pearlstone'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/pearlstone.html. 1828.