Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula CuAl6(PO4)4(OH)8·4H2O. 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.
Turquoise in "Eyewear"[]
Estevánico prized turquoise. During the Coronado Expedition, Estevánico often used his magical eyewear to help heal various natives he encountered. He took turquoise and a woman as payment for his services.
After his eyewear was stolen, Estevánico arrived at Hawikuh, where he demanded turquoise and a woman from the Zuni as a price to keep the Spanish from the attacking the Pueblo. The Zuni didn't believe him, and murdered him.
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