A naturally occurring, inorganic solid is termed a mineral. Minerals are defined by their specific chemical compositions and crystalline structures, distinguishing them from organic substances. They form through various geological processes, such as crystallization from a molten state or precipitation from solution. Common examples include quartz, feldspar, and mica. Minerals serve as essential building blocks for geological formations and natural resources, and they play a critical role in biological systems, contributing to the Earth’s biodiversity and ecosystem function.