The chemical makeup of a rock varies depending on its type and formation process. Generally, rocks are composed of one or more minerals, which are solid substances with a definite chemical composition and crystal structure.
For example, igneous rocks like granite are mainly composed of quartz, feldspar, and mica, each contributing to the rock’s distinctive appearance and characteristics. Sedimentary rocks, such as limestone, are primarily made up of calcite, while metamorphic rocks like schist contain minerals that have been altered under pressure and temperature.
In addition to minerals, rocks may contain other materials such as organic matter, glass, or volcanic ash, all of which play a role in defining the rock’s properties. Overall, the diversity in mineral composition is what gives different rocks their unique features and classifications.