A mixture of ammonium chloride and sand is a classic example of a mixture whose components can be separated by sublimation.

Ammonium chloride readily sublimes upon heating, meaning it transitions directly from a solid to a gaseous state, leaving the sand behind. The ammonium chloride vapor can then be cooled to resolidify it, completing the separation.

For more information, you can check these resources:

• Vedantu - Sublimation
• BYJU'S - Sublimation