A clay mineral that is a hydrous silicate of aluminum and magnesium and occurs in soft amorphous masses in the cavities of certain rocks.
A complex hydrous silicate of aluminum and magnesium, a light-colored, soft clay mineral, often found in veins and cavities in serpentine and basaltic rocks.
Origin of saponite
- Latin sāpō sāpōn- hair dye saponin –ite
From American Heritage Dictionary of the English Language, 5th Edition