The Etruscans carved many of their works from tufa, a soft porous variety of this calcium carbonate rock
The 
author goes on to say that there are many arguments to prove that ...... from some 
representative sites in the ancient Greco/Roman/ Etruscan/Egyptian world over 
.... All varieties of calcium carbonate are lightfast, making for a very... [DOC] [TLE] Corsi Collection of Decorative Stones - Classi [PAR] [p12] I warn readers that when referring to the various kinds of marble I shall ... 
soft to cut, that when struck by steel they do not give off sparks, and that their ....