Turquoise

Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminum. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique hue.

The substance has been known by many names, but the word turquoise, which dates to the 16th century, is derived from an Old French word for “Turkish”, because the mineral was first brought to Europe from Turkey, from the mines in historical Khorasan Province of Persia.

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