trass
(noun)
noun
1. (geology) A white to grey volcanic tufa, formed of decomposed trachytic cinders, sometimes used as a cement.
2. A coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water.
(noun)
1. (geology) A white to grey volcanic tufa, formed of decomposed trachytic cinders, sometimes used as a cement.
2. A coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water.