What is a common example of a mineral?

Gold is a common example of a mineral because it meets the fundamental criteria that define a mineral. Minerals are naturally occurring, inorganic solids with a definite chemical composition and a crystalline structure. Gold, as an element, is characterized by its metallic properties and is found in nature in its pure form, often mixed with other minerals. It is also not derived from biological processes, aligning with the definition of being inorganic.

In contrast, water is classified as a compound but is not a mineral because it is not a solid at standard conditions. Air is a mixture of gases and does not qualify as a mineral since it lacks a solid form and a defined composition. Oil, primarily derived from organic material, is classified as a hydrocarbon and falls under the category of organic substances rather than minerals. Therefore, gold stands out as a clear and straightforward example of a mineral.