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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.
Turquoise is a hydrous copper aluminum hydroxy-phosphate mineral, CuAl6(PO4)4(OH)8·4H2O. It is a secondary mineral that forms near the surface, usually near copper deposits. The color ranges from bluish to bluish-green to greenish and the hardness is 5 to 6 on the Mohs Scale. Crystals are rare - turquoise usually forms very fine-grained masses.
Crescent is located at the junction Nevada State Route 164, also known as the Joshua Tree Highway, and Crescent Peak Road.The community is fully surrounded by the Avi Kwa Ame National Monument and lies about 2 mi (3.2 km) east of the California border and 16 mi (26 km) west of Searchlight by road.
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
The Cerrillos Turquoise Mines are Ancestral Puebloan turquoise mines located in the Cerrillos Hills, 20 miles (32 km) southwest of Santa Fe, New Mexico.
Mineral symbols (text abbreviations) are used to abbreviate mineral groups, subgroups, and species, just as lettered symbols are used for the chemical elements.. The first set of commonly used mineral symbols was published in 1983 and covered the common rock-forming minerals using 192 two- or three-lettered symbols. [1]
Turquoise (/ ˈ t ɜːr k (w) ɔɪ z / TUR-k(w)oyz) is a cyan color, based on the mineral of the same name.The word turquoise dates to the 17th century and is derived from the French turquois, meaning 'Turkish', because the mineral was first brought to Europe through Turkey from mines in the historical Khorasan province of Iran (Persia) and Afghanistan today.