What's the difference between pipeclay and pipestone?

Pipeclay

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Definition:

• (v. t.) To whiten or clean with pipe clay, as a soldier's accouterments.
• (v. t.) To clear off; as, to pipeclay accounts.

Example Sentences:

Pipestone

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Definition:

• (n.) A kind of clay slate, carved by the Indians into tobacco pipes. Cf. Catlinite.

Example Sentences:

• (1) Facebook Twitter Pinterest Stopping to photograph and old wooden building near Pipestone, Manitoba.