Onyx or Hematite.

Onyx is a powerful protection base that absorbs and transforms negative energy and helps prevent personal energy from draining.
Hematite (even bloodstone) is an intense healing stone used to clear and adjust the lower chakras with the heart and is a leader to balance the entire body to overcome any inconvenience or anxiety in connection with the rejection of these energies. This stone is particularly stimulating for base and heart chakra. Blood stone is also a very popular stone and is particularly useful if you are threatened. Carry bloodstone to increase mental clarity and to help make decisions. It will encourage you to take action and give you courage and personal strength to do it. It gives a mental boost when the motivation is missing and can revitalize mind and body if you are exhausted.