The Etruscans carved many of their works from tufa, a soft porous variety of this calcium carbonate rock
...... Rosso antico, being composed of calcium carbonate, would form lime 
when... [DOC] [TLE] theophrastus on stones - Knowledge Bank - The Ohio State University [PAR] Department of Classics began work on an annotated translation ..... than 
Theophrastus, mentions about ten times as many kinds of rocks ...... For some 
can be carved, or turned on a lathe, or sawn; ...... calcium carbonate from its walls 
and deposit it on the objects ..... also certain other soft rocks suitable for building 
purposes.