Turquoise magnesite refers to an ore, which is composed of turquoise and magnesite. Turquoise: Turquoise is a gem-grade mineral, and its chemical composition is copper and aluminum phosphate. Showing blue-green or turquoise, with certain transparency. In jewelry making, turquoise is often used to make jewelry and decorations. Magnesite is a carbonate mineral containing magnesium, and its chemical composition is MgCO3. White or light yellow, rhombic crystal. Magnesite is often used in industry to make magnesium metal, refractories and fertilizers.