'Saponite' definitions:

Definition of 'Saponite'

From: GCIDE

Saponite \Sap"o*nite\, n. [Sw. saponit, fr. L. sapo, -onis, soap.] (Min.) A hydrous silicate of magnesia and alumina. It occurs in soft, soapy, amorphous masses, filling veins in serpentine and cavities in trap rock. [1913 Webster]