1. Salt - Table salt is a crystal made of sodium chloride.

2. Quartz Watches - Quartz crystals are used in watches to regulate timekeeping due to their piezoelectric properties (they generate electricity when compressed).

3. Diamonds - Diamonds are the crystalline form of pure carbon.

4. Glass - While glass is often called an amorphous solid, it actually has a crystalline structure at the atomic level.

5. Sugar - Table sugar (sucrose) forms crystals when it is processed.

Let me know if you'd like to know more about any of these!