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Rubstone vs Rudstone - What's the difference?

rubstone | rudstone |

As nouns the difference between rubstone and rudstone

is that rubstone is a stone for scouring or rubbing; a whetstone while rudstone is a calcareous rock consisting of coarse limestones supported by grains larger than two millimetres.

rubstone

English

Noun

(en noun)
  • A stone for scouring or rubbing; a whetstone.
    • (Webster 1913)

    rudstone

    English

    (Dunham classification)

    Noun

  • A calcareous rock consisting of coarse limestones supported by grains larger than two millimetres.