Saponite definitions

săp'ə-nīt'
A clay mineral that is a hydrous silicate of aluminum and magnesium and occurs in soft amorphous masses in the cavities of certain rocks.
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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.
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Origin of saponite

Latin sāpō sāpōn- hair dye saponin –ite