What is a mineral?

A mineral is defined as a natural, inorganic substance that has a specific chemical composition and a crystalline structure. This definition encompasses key aspects such as being naturally occurring, meaning it forms through geological processes without human intervention. Additionally, minerals are inorganic, which differentiates them from organic materials derived from living organisms. The characteristic composition refers to specific chemical formulas that define the mineral's identity and unique properties. This understanding of minerals is essential, especially in the context of colored stones, as it highlights the natural origins of gemstones and their classification based on chemical and physical properties. Other options like synthetic compounds or organic materials do not fit the definition of what a mineral is, as they derive from different origins and processes.