Min. [f. L. Tuesa the Spey, mistaken by Camden for the Tweed + -ITE1.] An indurated variety of lithomarge of a milk-white color.
1837. Thomson, in Proc. Berw. Nat. Club, I. No. 5. 157. Fracture earthy,… soiling the fingers;… tuesite and gypsum.
1868. Dana, Min. (ed. 5), 474. Tuesite of Thomson is a lithomarge from Scotland, used sometimes for slate pencils;… color milk-white.
