Saponite
Pronunciation : Sap"o*nite
Part of Speech : n.
Etymology : [Sw. saponit, fr. L. sapo, -onis, soap.] (Min.)
Definition : Defn: A hydrous silicate of magnesia and aluminia. It occurs in soft, soapy, amorphous masses, filling veins in serpentine and cavities in trap rock.
Source : Webster's Unabridged Dictionary, 1913