These tiny minerals, usually less than 3-4mm in diameter, are powerful amplifiers of energy and manifestation accelerators. The mineral is often crystallized in dodecahedral and trigonal formations...and can be found in Madagascar and Russia, and usually in the presence of Tourmaline.
The color of these tiny crystals are usually either yellow, grayish, light green, white or colorless, and you can sometimes get them in their matrix. They are not common, and are sometimes labeled as rare, but you can ususally find them at a reasonable price. Often they are sold in groups of three as this is how they are recommended to be used when keeping them on the body.
Their vibration can be felt very easily by most people. Even the bigger pieces may be classified as tiny.. and yet when you hold one between your fingers, you can easily feel a pleasant flush of energy...and their vibration may cause a flash of heat to go through your body.
"...in recent months I had the pleasure of holding Rhodizite in my hands and the memory of the experience will stay with me forever. Do you remember as a child ‘exploding candy’, well this is the exact experience I had with Rhodizite an explosion of energy as I held it.
As I placed the Rhodizite on my palm, the tiny crystals felt as if they were crackling and popping, and I was literally blown away as many physically jumped off my hand and rolled onto the floor. Not perturbed, I returned the wayward pieces to my palm, only to have the exact same experience again. By this stage I was breathless with excitement and couldn’t wait to spend some time with Rhodizite to find out more about its energetics."
These are also powerful stones to use to aid you to improve psychic powers. This crystal's energy is known to be very powerful to awaken many psychic gifts, including telepathy, distance viewing and psychic visions or clairvoyance, and maybe other psychic abilities. This is a crystal that has no negativity within its vibration, nor is it even neutral, but has a powerful positive resonance that will magnify the energy of any other crystals / stones you use with them...as well as magnifying what you think about.
The size is really unimportant as they have a quite potent energy. They boost the effect of any other crystal, so if you have a piece of another type of stone, that you haven't found to be working effectively, use it with one of these little crystals.
Here are a few excellent references with more metaphysical details:
Sacred Stones: Rhodizite
Crystal Master: Rhodizite