Healing Stones are usually egg sized, grey and flecked with silver or red. Only a Stonetalker can really distinguish them from other stones, and even a trained native can search all day and never find one. These stones can be used to heal wounds by touching them to the wound, and using the Stonetalker Gift (or the Healing Stones skill).
Only a Stonetalker can identify such a stone. They must be in the Dryland or Deadland hills, spend at least two days searching, and succeed in an identification roll resisted by an 18 (see Stonetalker rules).