After it has been quarried it is ground in mills, and used for cement stone under the name of trass.
Sometimes a proportion of common sand mortar instead of lime is mixed with the trass.
But the trass boy finished his remarks about destiny in a very short time.
trass, tras, n. a volcanic earth used as a hydraulic cement.
He wished that the trass boy would talk forever about destiny.
It is evident that this will form a pozzuolanic cement if a suitable silicious material such as trass is added to the cement.
The Dutch are very attentive in ascertaining the quality of the trass before using it in building their dikes.