a reddish argillaceous stone used by North American Indians for making tobacco pipes.

1755–65; pipe1 + stone

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World English Dictionary
pipestone (ˈpaɪpˌstəʊn)
a variety of consolidated red clay used by Native Americans to make tobacco pipes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The exhibit quarry floor is the bottom of the pipestone layer.
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