The toadstone, also known as bufonite (from Latinbufo, “toad”), is a mythical stone or gem that was thought to be found in the head of a toad. It was supposed to be an antidote to poison and in this it is like batrachite, supposedly formed in the heads of frogs. Toadstones were actually the button-like fossilized teeth of Lepidotes, an extinct genus of ray-finned fish from the Jurassic and Cretaceous periods. They appeared to be “stones that are perfect in form” and were set by European jewellers into magical rings and amulets from Medieval times until the 18th century.
From ancient times people associated the fossils with jewels that were set inside the heads of toads. The toad has poison glands in its skin, so it was naturally assumed that they carried their own antidote and that this took the form of a magical stone. They were first recorded by Pliny the Elder in the first century.
According to Paul Taylor of the London Natural History Museum:
Like tonguestones, toadstones were considered to be antidotes for poison and were also used in the treatment of epilepsy“. As early as the 14th century, people began to adorn jewelry with toadstones for their magical abilities. In their folklore, a toadstone was required to be removed from an old toad while the creature was still alive, and as instructed by the 17th century naturalistEdward Topsell, could be done by setting the toad on a piece of red cloth.
The true toadstone was taken by contemporary jewellers to be no bigger than the nail of a hand and they varied in colour from a whitish brown through green to black, depending on where they were buried. They were supposedly most effective against poison when worn against the skin, on which occasion they were thought to heat up, sweat and change colour. If a person were bitten by a venomous creature a toadstone would be touched against the affected part to effect a cure. Alternatively Johannes de Cuba, in his book Gart der Gesundheit of 1485, claimed that toadstone would help with kidney disease and earthly happiness.