A pumice stone is a lightweight, porous volcanic rock formed when lava cools quickly and traps gas bubbles. Its unique texture makes it effective for various uses, particularly in beauty and personal care. People often use pumice stones to exfoliate rough skin, especially on feet, helping to remove dead skin cells and calluses. In addition to personal care, pumice stones are also used in construction and landscaping. They can be ground into a powder for use in concrete and mortar, providing insulation and reducing weight. Their natural abrasiveness makes them useful in cleaning and polishing surfaces as well.