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Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
This is a list of types of sandstone that have been or are used economically as natural stone for building and other commercial or artistic purposes. Trans-regional [ edit ]
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks.
Quarried at Aquia Creek in Stafford County, Virginia, the stone was valuable for its ease of shaping and the quarry's proximity to the tidewater portion of the Potomac River, 45 miles (72 km) south of Washington. The sandstone was the principal material used in such significant buildings as the White House and the early stages of the U.S ...
Today nearly all these old quarries are flooded and a few are owned by camping resorts, rod and gun clubs or conservation clubs and used for recreational activities. Even though building stone was a relatively small percent of quarry output, the Medina sandstone legacy can be best seen today in the magnificent buildings built from this stone.
Firoozeh Koobi is a product made of copper, brass, silver, or bronze, in which small pieces of turquoise stone are placed together on a part of its surface in a mosaic form. [7] Turquoise inlaying is recognized in Iran as an art-industry in the division and classification of Iranian handicrafts, which has an artistic and aesthetic aspect and ...
The quarries and the stone temples here are visible from boats on the Nile. The quarry was active sometime during the Old Kingdom through the Late Period and remains largely intact in modern time. [1] Typical materials known from this site are: Sandstone [1] Some of the monuments known to come from this site are: Temple of Horemheb
The sandstone was quarried as dimension stone, ton stone, and rubble stone, with dimension stone the most marketable and costly. Blocks of dimension stone typically measured 8 by 4 by 2 ft (2.44 by 1.22 by 0.61 m). [50] The byproduct of removing the dimension stone was rubble stone, which was either sold cheaply or discarded entirely. [51]