Etymology
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soapstone (n.)

type of talc, 1680s, from soap (n.) + stone (n.). So called because it is occasionally used for cleaning.

updated on October 25, 2013

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Definitions of soapstone from WordNet

soapstone (n.)
a soft heavy compact variety of talc having a soapy feel; used to make hearths and tabletops and ornaments;
Synonyms: soaprock / soap-rock / steatite
From wordnet.princeton.edu, not affiliated with etymonline.