Classify each of the following as either elements or minerals: oxygen, cobalt, phosphorus, nitrogen, graphite, quartz, carbon, and clay.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Classify each of the following as either elements or minerals: oxygen, cobalt, phosphorus, nitrogen, graphite, quartz, carbon, and clay.

### Response:

Oxygen, cobalt, nitrogen, and carbon are elements. Phosphorus, graphite, quartz, and clay are minerals.