There are several crystals that are believed to have calming and relaxing properties:

1. Amethyst: Known for its ability to calm the mind and reduce stress and anxiety.

2. Rose Quartz: Promotes feelings of peace, love, and tranquility.

3. Blue Lace Agate: Helps soothe anxious feelings and promote a sense of calm.

4. Lepidolite: Known for its calming energy and ability to reduce stress and anxiety.

5. Howlite: Helps calm the mind and reduces tension and stress.

6. Clear Quartz: Known for its ability to amplify the energy of other crystals and promote clarity and inner peace.