Igneous, Sedimentary, Metamorphic.
Igneous rocks are made of solidified magma. Sedimentary rocks are those that are made by the weathering or erosion of soil of Earth. Metamorphic rocks are when rocks are changed from one material to another; new minerals are created.
Igneous rock, metamorphic rock, and sedimentary rock.
The dynamic changes between the three main rock groups
Clastic, Chemical, and Organic
Metamorphic, igneous and sedimentary
clastic organic chemical
sediment
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They're called metamorphic rocks.
sister groups
Periodic table has 18 groups; see the link below.
Scalene, Isosceles and Equilateral.
The classification is based on the processes that formed the rock.