A mineral is a naturally occurring, inorganic solid with a definite chemical composition and a crystalline structure. Minerals are the building blocks of rocks and are found in various forms, such as quartz, feldspar, and mica. They can be identified by their physical properties, including color, hardness, and luster. Minerals play a crucial role in many aspects of life and the environment. They are essential for the formation of soil, which supports plant growth, and are also important in various industries, including construction and electronics. Additionally, some minerals, like calcite and gypsum, are used in everyday products.