Encyclopaedic Dictionary of Folklore, Myth, and Magic
Agate – an agate stone is believed to quench thirst and turn away thunder in lightning. A black agate veined with white will protect a person from all violent dangers. Hyena-coloured agate can cause domestic unhappiness. Agate was thought to protect from the effects of poison, but agate shaped as eyes
Encyclopaedic Dictionary of Folklore, Myth, and Magic
Adamant – Adamant was a stone that once believed to be impenetrable, giving rise to the saying: "As hard as adamant." (Daniels, Encyclopaedia of Superstitions) It may be an archaic word for diamond. Because adamant was believed immune to fire, artisans would soak the mineral in goat's
Encyclopaedic Dictionary of Folklore, Myth, and Magic
Animal Lore (British Isles).