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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.
The site was rediscovered in 1809 by Ulrich Jasper Seetzen, and since then has seen several excavation teams, Richard Lepsius's excavation in 1845 being the first. Major C. K. McDonald's visits to the site, including residence at the site from 1854–1866 (and an effort to mine turquoise there) resulted in only surface finds (arrowheads and such) with no further excavation.
The rediscovery of the turquoise mines in what would become Crescent is reported to have been made by prospector George Simmons, who first found the deposits in 1889 or 1890 while searching for copper and returned to the area two years later to begin mining upon realizing that he had found turquoise, as recorded by Frank R. Morrissey in a 1968 ...
Turquoise mined at this location is known as "Kingman Turquoise." This mine was worked for turquoise by Native Americans before European contact. Archaeological evidence includes "Hohokam hammers, dating back to 600 a.d." and the Navajo hammers. "In the late 1880s to the early 1900s, Mineral Park was mined by the Aztec Turquoise Co., the Los ...
The finer-grained, sandy deposits consist of eolian and playa lake deposits. The latter contain well-preserved freshwater fossils. Numerous concordant radiocarbon dates indicate that the bulk of these sediments accumulated between 15,000 and 8,000 BP during the African humid period. These deposits lie directly upon deeply eroded and weathered ...
The Cerrillos Turquoise Mines are Ancestral Puebloan turquoise mines located in the Cerrillos Hills, 20 miles (32 km) southwest of Santa Fe, New Mexico.
Little is known about the history of the oldest exposed rocks in the area due to extensive metamorphism.This somber, gray, almost featureless crystalline complex is composed of originally sedimentary and igneous rocks with large quantities of quartz and feldspar mixed in. [1] The original rocks were transformed to contorted schist and gneiss, making their original parentage almost unrecognizable.
West of Gunung Merapi is the Ijen volcano, which has a one-kilometre-wide (0.62 mi) turquoise-coloured acidic crater lake. The lake is the site of a labour-intensive sulfur mining operation, in which sulfur-laden baskets are carried by hand from the crater floor.