Classify the following as pure substances or mixtures. Separate the pure substances into elements, compounds and divide the mixtures into homogeneous and heterogeneous :
Diamond

Explanation

To classify diamond as either a pure substance or a mixture and further categorize it, we can follow these steps:

### Step-by-Step Solution:

1. **Identify if Diamond is a Pure Substance or a Mixture**:
- Diamond is a form of carbon and is made up of only one type of atom, which is carbon. Therefore, it is classified as a pure substance.

2. **Classify the Pure Substance**:
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