toadstone

A stone once worn as a charm and believed to have been formed in the body of a toad.

In geology, a volcanic rock varying in texture from a soft crumbly ash to a hard close-grained greenstone, several beds of which occur in the magnesian limestone of the lead-mining district of Derbyshire

Any one of various natural or artificial objects resembling a toad in form or color, or which were believed to have been formed within the body of that animal, and which for many centuries, and over a large part of Europe, were held in high regard, and preserved with the greatest care. ;

A local name for the igneous rocks of Derbyshire, England; — said by some to be derived from the German todter stein, meaning dead stone, that is, stone which contains no ores.

Bufonite, formerly regarded as a precious stone, and worn as a jewel. See Bufonite.

A small stone, once believed to be a jewel embedded in the head of a toad, worn as a amulet