Bible Dictionaries
Tridymite

Webster's Dictionary

(n.) Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.

Bibliography Information
Webster, Noah. Entry for 'Tridymite'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/tridymite.html. 1828.