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Porphyry Stone Stone Inc.

Porphyry is a natural stone quarried and manufactured by Odorizzi Porfidi Spa in Italy and Argentina.

This volcanic rock is formed from a slow cooling process of igneous material. The chemical composition of porphyry (over 70% silica, 14% aluminum, 8% alkali and small percentages of iron, calcium, and magnesium), its mineral composition (quartz, sanidine and plagioclase crystals with smaller amounts of biotite, and of pyroxenes in a vitreous paste) and its distinctive structure, as well as stratification, determine porphyry's technical characteristics (high compression breaking point, high resistance to chemical agents, high sliding and
rolling friction) which make it one of the best materials for paving and facing.

The website has a list of SPECIFICATIONS and ASTM standards for Porphyry Stone. Visit us at www.porphyryusa.com.
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Web: www.porphyryusa.com
E-Mail: pavers@porphyryusa.com