saponite

saponite

[sap-uh-nahyt]
noun
a clay mineral, hydrous magnesium aluminum silicate, belonging to the montmorillonite group: found as a soft filling in rock cavities.

Origin:
1840–50; < Swedish saponit < Latin sāpōn- (stem of sāpō) soap + Swedish -it -ite1

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World English Dictionary
saponite (ˈsæpəˌnaɪt)
 
n
a clay mineral consisting of hydrated magnesium aluminium silicate and occurring in metamorphic rocks such as serpentine
 
[C19: from Swedish saponit (a rendering of German Seifenstein soapstone), from Latin sāpōsoap]

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