“The stone in quarries is found to be of different and unlike qualities. In some it is soft… in others it is medium… in still others it is hard as in lava quarries. There are also numerous other kinds:”

—  Vitruvius , book De architectura

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book II, Chapter VII, Sec. 1
Context: The stone in quarries is found to be of different and unlike qualities. In some it is soft... in others it is medium... in still others it is hard as in lava quarries. There are also numerous other kinds: for instance, in Campania, red and black tufas; in Umbria, Picenum, and Venetia, white tufa which can be cut with a toothed saw like wood.

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Roman writer, architect and engineer -80–-15 BC

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Context: There are also several quarries called Anician in the territory of Tarquinii, the stone being of the color of peperino.... Neither the season of frost nor exposure to fire can harm it, but it remains solid and lasts to a great age, because there is only a little air and fire in its natural composition, a moderate amount of moisture, and a great deal of the earthy. Hence its structure is of close texture and solid, and so it cannot be injured by the weather or by the force of fire. Monuments in the neighborhood of the town of Ferento which are made of stone from these quarries... gracefully carved. Old as these are, they look as fresh as if they were only just finished. Bronze workers, also, make molds for the casting of bronze out of stone from these quarries and find it very useful in bronze-founding.

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