Bible Dictionaries
Phyllite

Webster's Dictionary

(1):

(n.) Clay slate; argillaceous schist.

(2):

(n.) A mineral related to ottrelite.

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