Geodes
Geodes are often used for protection or spiritual aid and growth. They inherently amplify and protect good energy. Overall, the stone purifies and amplifies the body's natural healing properties and strengthens the spirit. It is also believed to provide the balance necessary to avoid depression or unnatural feelings of fear or dread.
Chakras:
All Zodiac: All
Reference: https://www.hippiemystique.com/blogs/news/crystal-meanings/