Tyndall-stone meaning

(Canada) A dolomitic limestone quarried in the vicinity of Tyndall, Manitoba, Canada, famous for its pervasive mottling and numerous fossils.
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Origin of 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.

    From Wiktionary