Turquoise crystals, a selection of specimens of this crystallized mineral species. Turquoise is a mineral, here many collector’s items presented with a description, one or more photos and sometimes a video. These turquoises are for sale.
It’s a hydrated phosphate of copper and aluminum, with the chemical formula CuAl₆(PO₄)₄(OH)₈-4H₂O, of the triclinic crystal system.