Most rocks are made up of minerals, regardless of their size.
Any naturally occurring solid mass or combination of minerals or mineraloid materials is referred to as a rock. It is divided into groups based on the minerals it contains, its chemical makeup, and how it is produced. Except for the liquid outer core and pockets of magma in the asthenosphere, the Earth's crust and the majority of its interior are made of rocks.
Rocks are broadly of three types: Igneous rocks, sedimentary rocks, and metamorphic rocks are categories into which rocks are typically divided. Igneous rocks are rocks cooled from magma. Sedimentary rocks are depositional rocks formed by the lithification of sediments. Metamorphic rocks are recrystallized rocks without melting.
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