Bible Encyclopedias
Tufa

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

a porous stone (called travertine when compact) found in calcareous streams, and used, from its lightness, in vaultings, as at Bredon and Canterbury.

Bibliography Information
McClintock, John. Strong, James. Entry for 'Tufa'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/​encyclopedias/​eng/​tce/​t/tufa.html. Harper & Brothers. New York. 1870.