Many years humans gather around fire; this lead our ancestors to create tools. These evolution's later expanded our knowledge of nature it sacredness and power. These discoveries later lead up to crystals.
All human cultures have utilized crystals from decoration, tools for hunting, makeup, medicine, divination psychic power enhancing and energy healing.
How is crystal healing done? Everything has and electromagnetic field aka and aura. These energy fields can hold or express foreign and personal energy. Crystal are placed in specific spot on the body or in the aura field to aid emotions, body, mind and spirit to heal or develop balance.