Which specimen/s (mineral and rock) contain/s most MgO?

Ceramics, limestone, stream sediments

Explanation:

MgO Magnesium oxide is an inorganic component that occurs in nature as a mineral periclase it is mostly used as a liquid medium. and has nonmedical uses an used as a heat resistant agent in wires. It has poor water solubility used for food and drugs owning to its crystalline structure. Also used as a protective coating in plasma displays.