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Updated: May 19, 2025
Three different kinds of stone compose the basis of the Roman Campagna; the tufa litoide, as hard and durable as granite, used extensively for building purposes; the tufa granolare, which is consistent enough to retain the form given to it by excavators, but it is useless as building material, and lastly the Pozzuolana, largely employed in the making of Roman cement.
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