What is the form of turquoise?

Turquoise is a blue-to-green mineral that is a hydrous phosphate of copper and aluminum. It typically forms in nodular or granular masses and can also occur as compact, cryptocrystalline aggregates. The mineral is known for its unique color, which is due to the presence of copper and iron, and is often used in jewelry and decorative items. Its characteristic waxy luster and opaque appearance make it easily recognizable.