Carbon exists in several different allotropes, each with their own distinct melting and boiling points. Here are some of the common allotropes of carbon and their melting and boiling points:

1. Graphite:

- Melting point: Approximately 3,652°C (6,605°F)

- Boiling point: Sublimates at around 3,800°C (6,872°F) without melting

2. Diamond:

- Melting point: Approximately 3,550°C (6,422°F) at extremely high pressure (greater than 1 million atmospheres)

- Boiling point: Sublimates at around 4,200°C (7,592°F)

3. Amorphous Carbon (e.g., Charcoal, Soot):

- Melting point: Does not have a distinct melting point; gradually transforms into graphite at high temperatures

- Boiling point: Sublimates at around 4,000°C (7,232°F)

4. Fullerene (e.g., Buckminsterfullerene C60):

- Melting point: Approximately 720°C (1,328°F)

- Boiling point: Sublimates at around 850°C (1,562°F)

It's important to note that these values can vary depending on the specific conditions and experimental setups. Furthermore, carbon can form various other allotropes under different synthesis conditions, and their melting and boiling points may differ from the values mentioned above.