These rather special  rock crystal tumbled stones

are Medium size

Rock crystal tumbled stones colour is Clear. Probably the most versatile multi purpose healing stone. Easy to cleanse and store infomation and energy in, program or amplify energy and for healing with. Can both draw and send energy. Powerful clear ones open Brow, Crown, and Transpersonal Chakra for meditation, sending/receiving guidance. Stimulates natural crystals in body tissues and fluids to resonate at new healing frequency. See also many other stones (Amethyst, Tiger's Eye...) Yin or Androgynous. Works with all chakras and master gland.