On the basis of enthalpy of formation, graphite is more stable than diamond, yet diamond does not change into graphite for years. Why ?

On the basis of enthalpy of formation, graphite is more stable than diamond, yet diamond does not change into graphite for years. Explain why?

On the basis of heat of combustion values, graphite is more stable than diamond. However, diamond does not change into graphite for years together.

Give reasons for the following: On the basis of heat of combustion values, graphite is more stable than diamond. However, diamond does not change into graphite for years together.

Thermodynamically graphite is more stable than diamond but diamond does not transform into graphite on its own. Why?

Graphite is denser than diamond.

Graphite is denser than diamond

Why diamond is hard compared with graphite?

Why diamond is hard compared with graphite?