toadstone

English
Toadstones from Jurassic sediments in Oxfordshire UK

Etymology

toad +‎ stone

Noun

toadstone (countable and uncountable, plural toadstones)

  1. A small stone, once believed to be a jewel embedded in the head of a toad, worn as an amulet.
  2. (geology) A soft, earthy variety of trap-rock of a brownish-grey colour, looking like an argillaceous deposit.
    • 2004, Robert E Schofield, The Enlightened Joseph Priestley, Pennsylvania State University, published 2004, page 162:
      Rowley-Rag appeared to be the same thing as basalt and toadstone resembled some species of lava.

Translations
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