Turquoise is a semi-precious stone of a beautiful blue. Only certain types of turquoise minerals are suitable for producing pigments. Turquoise is a blue-green mineral that is a hydrophosphate of copper and aluminum with the chemical formula CuAl6(PO4)4(OH)8-4H2O (A hydrated phosphate of copper and aluminum).
Turquoise, light blue is suitable for tempera, watercolor, acrylics