Material: Minerals: Lava Rock

beadtraders.com tells us that:

"Lava stones are formed when volcanoes erupt. The lava shoots out of a volcano and runs down its side. Once this incredibly hot liquid rock dries, it becomes a lava stone. Because of these processes, lava stone is considered to be a stone of rebirth. Many experts think it is the fiery strength of the volcano that formed them that leads to lava stones holding so many healing properties.
"The chakra, a concept from Indian culture and mysticism, concerns the human body’s centers of spiritual power. 
"Many users of lava stone believe it grounds and stabilizes the root chakra because of the stone’s strong connection with the earth. When the root chakra is stabilized, the body and mind will feel positive, safe and anchored to the earth.
"Believers in the energy of the atmosphere and healing properties of stones already know how valuable lava stones can be in calming the body. Because lava stones come from deep within the earth, it is believed they carry an energy similar to the place where they originated. 
"This energy is said to help people who are feeling anger and negativity, reducing those emotions and replacing them with strength and courage. Lava stones can also increase your general energy, protection and assertiveness as well.
"The effects lava stones have on the root chakra are similar to the grounding effects they can provide in general. These grounding effects can bring stability to the lava stone wearer’s life and can reduce their feelings of anxiety. It is thought this stability is due to the strong connection to the earth the lava stones possess.
"If you’re more skeptical of lava stones’ healing properties, suspending your disbelief for a short period might help the stones work better: Sometimes, belief itself is a way to reduce anxiety.
"Lava stones are by nature quite porous, meaning they have lots of tiny holes inside them. The porous nature of the stones makes them perfect diffusers for whatever essential oil you prefer to use.
"Lava stones can diffuse any essential oil, but experts recommend choosing one with complementary properties to the diffuser (in this case, the lava stone). Many lava stone wearers use lemon and lavender essential oils. These oils can help with stress, anxiety and low levels of energy.
"Lemon is an uplifting essential oil that can provide energizing and positive healing properties. Lavender, on the other hand, is a more relaxing essential oil for its ability to relieve stress, provide relaxation and help with falling asleep. Some people who choose to imbue their lava stone jewelry with lavender will put the stones under their pillow for use as a sleep aid.
"Similar to most healing gemstones, lava stones are thought to work best when worn close to or directly touching the skin because there is no barrier or blockage needed with this particular stone, which allows energy to flow easily and clearly.
"Many people choose to wear lava stones on bracelets around their wrists during the day, and some will keep their jewelry close to them at night as well to maximize the benefits of the stones. However, some will choose to store their lava stones in a room near them to keep a balance of energy and assist with the clearing of emotions."

https://www.thebeadtraders.com/blogs/news/benefits-lava-stone-beads