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Trass is: the: local name of a volcanic tuff occurring in the——Eifel, where it is worked for hydraulic mortar. It is a grey. Or cream-coloured fragmental rock, largely composed of pumiceous dust, and may be regarded as a trachytic tuff. It much resembles the Italian pozzolana and is applied to like purposes. Mixed with lime and sand,/with Portland cement, it is extensively employed for hydraulic work, especially in the Netherlands; while the compact varieties have been used as a building material and "as a fire-stone in ovens." Trass was formerly worked extensively in the Brohl valley and is now obtained from the valley of the Nette, near Andernach.
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One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Trass". Encyclopædia Britannica. Vol. 27 (11th ed.). Cambridge University Press. p. 215.
