[Answer] What is NOT one of the three types of rock?

Step 1 : Introduction to the question "What is NOT one of the three types of rock?"

...There are three basic types of rock, which are classified based on their structure and how they're formed. Igneous rocks are formed when magma or lava cools and solidifies. Sedimentary rocks are made by many small particles coming together to accumulate in layers. Metamorphic rocks result when other existing rocks are fundamentally changed by heat, pressure, or chemicals. Graphite is a form of crystalline carbon, but is not its own kind of rock.

Step 2 : Answer to the question "What is NOT one of the three types of rock?"

Graphite:

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