Turquoise is made of iron, copper sulfate, aluminum and water molecules, and 9 countries in the world have turquoise mines, but the highest quality turquoise in the world belongs to Neishabour mine. Neishabour Turquoise Mine is the oldest active mine in the world and archaeological evidence shows that there are remnants of turquoise mining from 6,700 years ago, and although many old mines were abandoned after mining, the Turquoise Mine is still active. For more information about Neishabour Turquoise Stone export, visit our site.