Also known as "Float on the Sea Stone" as large chunks have been found floating on the ocean waters; some large enough to carry a small animal. Yes, pumice is so light, many can float in water.
Pumice forms when lava is cooled above the ground and as the gas escapes little pocket or holes are left which is a characteristic of the stones.
Ground pumice is used in soap, polishes and cleaners.
A stone of the element Air and planet Mercury. Used for: Easing Childbirth, Banishment, Protection.
Pumice is good for absorbing negative energy. Throw into a body of water or bury it when complete.