Manganese(II) oxide, with the chemical formula MnO, is a black or brown solid that occurs naturally as the mineral pyrolusite. It is commonly used in various industrial applications, including the production of glass, ceramics, and batteries. Manganese(II) oxide serves as a precursor for other manganese compounds and is also utilized as a pigment. In addition to its industrial uses, manganese(II) oxide plays a role in agriculture as a micronutrient for plants. It is essential for photosynthesis and helps in the synthesis of chlorophyll. Proper levels of manganese are crucial for healthy plant growth and development.