From the French “pierre turquoise”, Turquoise is a gemstone from Turkey. Its name was proposed, in 1678, by the famous stone dealer Jean-Baptiste Tavernier. 
Usually in shades of blue to green, was named not because it originated from this region, but because Constantinople (present-day Istanbul in Turkey) was a relevant trading post of this gemstone. 

Solid and opaque, sometimes presents veins yellow or dark brown to black due to manganese oxide, limonite or other minerals popularly called the turquoise matrix. In certain varieties, pyrite inclusions are visible.

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