Hoarstone is a term that refers to a type of stone that has been weathered by natural forces like frost or snow. Synonyms for hoarstone include 'frost stone', 'ice stone', 'winter stone', 'weathersone' or 'weathered rock'. These rocks are known for their unique appearance, with a rough surface and often with numerous lichens and mosses growing on them. They can be found in many locations throughout the world, but are especially common in areas with colder climates. Hoarstones have been used in some cultures for their supposed mystical or spiritual properties, and are sometimes incorporated into traditional rituals or ceremonies.