Pietra Serena Sandstone
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Synonyms: Pietra Serana, Pietra Sirena
Location: Pietra Serena sandstone is quarried near Cavriglia, Cortona, Arezzo, Carmignano, Cortona, Firenzuola, Provincia di Firenze, Apennin, Tuscany, Italy.
Description: Pietra Serena sandstone is a fine-grained, medium to light grey, litharenite sandstone of the Lower Tertiary period. This stone internationally may be nominated as a sandstone and in the area of application of the European Standard this stone must be nominated as sandstone.
A small sample of Pietra Serena sandstone is usually representative owing to little variation in colour and veining. Swatch samples must be approved for large projects to ensure that the blocks are all extracted from the same quarry face for matching purposes. Ideal for both interior and exterior it has been in use for over 2,000 years.
Mineral Composition: Average by %:
Sandstone: Is an arenaceous sedimentary rock composed mainly of feldspar and quartz and varies in colour (in a similar way to sand), through grey, yellow, red, and white. Sandstones are often relatively soft and easy to work which therefore make them a common building and paving material. Sedimentary rock is formed from the weathered remains of other rocks. Sedimentary rocks are formed from overburden pressure as particles of sediment are deposited out of air, ice, or water flows carrying the particles in suspension. As sediment deposition builds up, the overburden (or lithostatic) pressure squeezes the sediment into layered solids in a process known as lithification ("rock formation") and the original connate fluids are expelled.