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.

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