Bible Dictionaries
Vermiculite
Webster's Dictionary
(n.) A group of minerals having, a micaceous structure. They are hydrous silicates, derived generally from the alteration of some kind of mica. So called because the scales, when heated, open out into wormlike forms.
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Bibliography Information
Webster, Noah. Entry for 'Vermiculite'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​v/vermiculite.html. 1828.