If you mean the different types, there are sedimentary, metamorphic, and igneous. Sedimentary is formed when layers and layers of sediment are cemented together. During the process of metamorphism, no new substance is formed. The rock is compressed by heat or scolding water, and pressure. That is how metamorphic rock is formed. Lastly, igneous rock is formed when magma and/or lava cools and hardens. An example of sedimentary rock is limestone. A metamorphic, slate. A good example of igneous is granite, and everyone knows what that is.
Classes
well there were different classes in different areas and all called by different levels but they were all mostly poor, middle classes, and upper class.
Such rocks are porphyritic.
Rocks with stripes are known as banded rocks or striped rocks. These stripes are often caused by the layering of different minerals or the presence of alternating bands of different mineral compositions within the rock.
People who identify different types of rocks are called geologists. Specifically, those who focus on the study of rocks and their formation are often referred to as petrologists. They analyze the composition, texture, and structure of rocks to understand geological processes and history.
All the classes of rocks. The igneous, sedimentary and metamorphic rocks
Sedimentary, Igneous and Metamorphic.
A person who looks for rocks is typically called a rockhound or a mineral collector. They enjoy finding, collecting, and studying different types of rocks and minerals as a hobby.
These are called veins
The different bands in sedimentary formations are called strata.
Igneous, Sedentary, and Metamorphic.
The system is called the Caste system.