Black Agate and lava stone
Lava is associated with the root chakra as, like roots, it comes from deep in the ground. The earthy qualities of lava make it a stone of grounding, focus and balance, materialism and restraint. Its fiery energy is associated with passion, assertiveness and energy. When you are drawn to lava you may be seeking energy and stamina. It is also said to be useful as a stone of detoxification, to dissipate anger and to clear negative energy. Crystal healers use it to help with anxiety, emotional tranquility, relaxation and a sense of calmness. It is said to be a "stress-absorber."
Black Agate is a stone of strength. It was used by the Ancients on the breastplates of armor to give warriors strength . While known to promote self-confidence and courage, the stone is also symbolic of resilience and prosperity.