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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.
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 ...
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 ]
Medina sandstone is a geographic subset of the Medina Group stratigraphic formation in New York State and beyond. The name refers specifically to sandstone first quarried in Medina, New York, and later quarried in other locations in Orleans County and adjacent quarries in Monroe County to the east and Niagara County to the west.
Zircon age‐spectra for the sandstones of the Wilcox Group reveal a complex grain assemblage derived from Laramide uplifted crystalline blocks of the central and southern Rocky Mountains, the Cordilleran arc of western North America, and arc‐related extrusive and intrusive igneous rocks of northern Mexico.
Citrine “A powerful gemstone crystal in a range of deep yellows, oranges, and yellow-cream-white, the citrine gemstone is said to bring abundance and wealth into one’s life,” Salzer says.
The stones are housed in the Harthill Greenhouses in Calderstones Park, having been moved from their previous location in an enclosure just outside the park gates in 1954 to protect them from further weathering. [4] Nearby Robin Hood's Stone was originally one of the Calderstones, and has been relocated. [5]
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