saponite

noun
sap·​o·​nite | \ˈsa-pə-ˌnīt \

Definition of saponite 

: a hydrous magnesium aluminum silicate occurring in soft soapy amorphous masses and filling veins and cavities (as in serpentine)

First Known Use of saponite

circa 1849, in the meaning defined above

History and Etymology for saponite

Swedish saponit, from Latin sapon-, sapo soap

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The first known use of saponite was circa 1849

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