* Composition: Rocks can be classified based on their chemical composition, which is determined by the minerals they contain. Some common rock types based on composition include igneous rocks, sedimentary rocks, and metamorphic rocks.

* Texture: Rocks can be classified based on their texture, which is determined by the size, shape, and arrangement of the minerals they contain. For example, rocks can be coarse-grained or fine-grained, and they can have different types of grain shapes and surface textures.

* Structure: Rocks can be classified based on their structure, which is determined by the way they are formed and by the geological processes they have undergone. For example, rocks can be massive, layered, or foliated.

* Origin: Rocks can be classified based on their origin, which can be defined in several ways. Some common classifications based on origin include igneous rocks, sedimentary rocks, and metamorphic rocks. This type of classification reflects the conditions under which the rocks were formed.