Turquoise ( 绿松石): CuAl6(PO4)4(OH)8.5H2O
Turquoise is a semi-precious stone, valued in many countries throughout history. It has been called the Turkish stone since the 13C, possibly because the Turks used it so much. It was highly prized by the Aztecs, and it is important to the Navaho people. It has been mined for thousands of years in the Sinai peninsular.
There is a medieval legend that the colour would fade if the stone was in contact with a sick person, but it would regain its colour near someone who was healthy.
Toxicity: Dioptase is moderately toxic and care should be used in handling the dry powder pigment as well as the pigment dispersed in medium.
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