Turquoise is an opaque, blue-to-green mineral that is a hydrated phosphate of copper and aluminium, with the chemical formula CuAl6PO44OH8Ãâ÷4H2O. It is rare and valuable in finer grades and has been prized as a gemstone and ornamental stone for thousands of years owing to its unique hue. In recent times, turquoise has been devalued, like most other opaque gems, by the introduction onto the market of treatments, imitations and synthetics. The gemstone has been known by many names. Pliny the Elder referred to the mineral as callais and the Aztecs knew it as chalchihuitl. The word turquoise dates to the 17th century and is derived from the French turquois for `Turkish` because the mineral was first brought to Europe through Turkey, from mines in the historical Khorasan Province of Persia.
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132128007
拍攝者:
Mohaeljawphoto
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授權類型 | 尺寸 | 像素 | 格式 | 點數 | |
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標準授權 | XS | 480 x 319 | JPG | 13 | |
標準授權 | S | 800 x 532 | JPG | 15 | |
標準授權 | M | 2480 x 1650 | JPG | 18 | |
標準授權 | L | 2741 x 1823 | JPG | 20 | |
標準授權 | XL | 3467 x 2307 | JPG | 22 | |
標準授權 | MAX | 4246 x 2825 | JPG | 23 | |
標準授權 | TIFF | 3507 x 2333 | TIF | 39 | |
進階授權 | WEL | 4246 x 2825 | JPG | 88 | |
進階授權 | PEL | 4246 x 2825 | JPG | 88 | |
進階授權 | UEL | 4246 x 2825 | JPG | 88 |
XS
S
M
L
XL
MAX
TIFF
WEL
PEL
UEL
標準授權 | 480 x 319 px | JPG | 13 點 |
標準授權 | 800 x 532 px | JPG | 15 點 |
標準授權 | 2480 x 1650 px | JPG | 18 點 |
標準授權 | 2741 x 1823 px | JPG | 20 點 |
標準授權 | 3467 x 2307 px | JPG | 22 點 |
標準授權 | 4246 x 2825 px | JPG | 23 點 |
標準授權 | 3507 x 2333 px | TIF | 39 點 |
進階授權 | 4246 x 2825 px | JPG | 88 點 |
進階授權 | 4246 x 2825 px | JPG | 88 點 |
進階授權 | 4246 x 2825 px | JPG | 88 點 |