Worn on the body, minerals are thought to prevent cholesterol coagulation and build-up in blood vessels. Cells throughout the body are invigorated and immune function is enhanced by minerals. It is also thought to purify the blood, stimulate the autonomic nervous system, calm overexcited sympathetic nerves, and promote sound sleep.
In holistic healing, minerals are known for a variety of healing properties (such as enhancing mental alertness, increasing self-confidence, and strengthening one's psychic energy), with the particular use depending on the color of the gem. Black minerals has been used since ancient times to deflect negative energy. It is linked to the root chakra and spiritual grounding in energetic healing and is used for treating anxiety, nervous disorders, kidney and adrenal problems, and heart disease. Black minerals are also thought to boost immune function and shield the body from the effects of radiation.