Mineral, In a strict sense, a mineral is a naturally occurring solid substance that has a definite, uniform chemical composition and that was formed by an inorganic process—that is, by a process not involving living things. The study of such substances is called mineralogy. In a much broader sense, a mineral is any substance in the mineral kingdom—the realm of nature made up of nonliving things.

Substances that are obtained from the earth for their commercial value are commonly referred to as mineral resources. (Some of them, such as asphalt, chalk, coal, and petroleum, are not minerals in the strict sense of the word because they lack a definite chemical composition.) People, have always depended on various mineral resources to help provide for many basic needs.

Minerals usually occur in combination with each other or with other substances.

Rock is a mixture of minerals.

Ore is rock that contains economically important amounts of one or more minerals. The most important ores are those that contain metals.

Gems are rocks that are highly prized for their beauty.

Dietary Minerals are certain chemical elements that occur in foods and that are essential to life.