Tyndall stone

After the town of Tyndall, Manitoba, where the stone is quarried, in turn named after Irish physicist John Tyndall (1820–93). Tyndall, Tindall (“inhabitant of the Tyne river valley”) < Tyne.

• IPA^(key): /ˈtɪndəl stoʊn/

Tyndall stone (usually uncountable, plural Tyndall stones)

1. (Canada) A dolomitic limestone quarried in the vicinity of Tyndall, Manitoba, Canada, famous for its pervasive mottling and numerous fossils.
   • 1994, Carol Shields, The Stone Diaries, Toronto: Penguin., →ISBN, page 64:

     More and more my father chooses to decorate the stone surfaces with elaborate cipher, even though Tyndall stone, with its mottled coloring, is thought to be resistant to fine carving.

• Tyndall limestone