Definition of "cymolite"

Cymolite. Is a substance nearly allied to the preceding [Green Earth] and the following [Fuller’s Earth]; colour white, or with a reddish tinge, adheres to the tongue; in water separates in laminæ, which become translucent; is rare: from Derbyshire.

1816, John Mawe, A Descriptive Catalogue of Minerals, Intended for the Use of Students, pages 56–57

Some similar plates have been obtained with the montmorillonites of St. Jean de Cole (Dordogne), of Confolens (Charente), the “confolensite” of Confolens (Charente), the steargilite of Poitiers (Vienne), the cymolites of the Isle of Cymolis (Greece), and the smectic clays of Reigate (England), and of Styrie.

1976, Wesley William Wendlandt, L.W. Collins, editors, Thermal Analysis, Dowden, Hutchinson & Ross, page 15