Turquoise
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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 CuAl648·4H2O. It is rare and valuable in finer grades and has been prized a
Turquoise 40031
"Big Blue", a large turquoise specimen from the copper mine at Cananea, Sonora, Mexico
Massive Kingman blue turquoise in matrix with quartz from the Mineral Park mine, Arizona, US
Turquoise of Madan-e Olya of Nishapur
Nishapur
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Nishapur or Neyshabur is a city in the Central District of Nishapur County, Razavi Khorasan province, Iran, serving as capital of both the county and the district.
Turquoise
…has been prized as a gemstone for millennia due to its hue. The robin egg blue or sky blue color of the Persian turquoise mined near the modern city of Nishapur, Iran, has been used as a guiding reference for evaluating turquoise quality. Like most other opaque gems, turquoise has been devalued by the introduction…
آرامگاه عمر خیام
Abbasi Karvansaray in Neyshabur
Attar tomb
Mahrough