In Ancient Egypt, the Mer-Ka-Ba was three words. Mer meant a kind of light that rotated within itself, Ka meant the human spirit, and Ba, the human body. So Merkaba means a rotating light that would take the spirit and the body from one world or form into another. It can be activated by meditation, with the breath, and by changes in perception.
Quartz is the master stone, once thought to be solidified light. Special characteristics of storing (programming), amplifying & transmitting thoughts and energy. Activates pineal and pituitary glands. Excellent for meditation and accessing higher self and guides.