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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.
Kunyu Wanguo Quantu, printed in Ming China at the request of the Wanli Emperor in 1602 by the Italian Catholic missionary Matteo Ricci and Chinese collaborators, the mandarin Zhong Wentao, and the technical translator Li Zhizao, is the earliest known Chinese world map with the style of European maps. [1]
Amber is the third-rarest natural eye color after green and gray, occurring in 5% of the world's population. [36] People with amber-colored eyes are found in Europe , and in fewer numbers in the Middle East , North Africa , and South America .
The Natural History Museum of Los Angeles County's latest jewelry show is one of the most spectacular precious stone exhibitions you're likely to see.
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In February 2007, the world's rarest baseball card sold at auction for $2.3 million. If you think that's totally wild, consider the world's rarest bible, which could net you $25 to $35 million ...
Egypt has substantial mineral resources, including 48 million tons of tantalite (fourth largest in the world), 50 million tons of coal, and an estimated 6.7 million ounces of gold in the Eastern Desert. [1] The total real value of minerals mined was about E£102 million (US$18.7 million) in 1986, up from E£60 million (US$11 million) in 1981. [2]
Bisbee turquoise commonly has a hard chocolate brown colored matrix. Bisbee Blue or Bisbee turquoise refers to the turquoise that comes from copper mines located in the vicinity of Bisbee, Arizona. Bisbee turquoise can be found in many different shades of color and quality, from soft, low quality pale blue, to the quality hard brilliant blue ...