this activity involves placing the crystals and/or minerals upon the body of another.  Ancient civilization has used this art to facilitate healing on all levels, affecting an aligned connection between the perfection of etheric body and the physical form, promoting the energy to transfer from minerals to the physical form.  This art can be used to initiate healing, astral travel, travel to the center of ones being.  Intuition is your best guide and recommended crystals/minerals for grounding to the physical plane.  Information is available with regards to the use of Laying-on-of-Stones  - "Love Is In The Earth - Laying-On-Of-Stones".