saponite definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
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: Swedish saponit ; from Classical Latin sapo: see saponify and amp; -ite
saponite definition by American Heritage Dictionary
A clay mineral that is a hydrous silicate of aluminum and magnesium and occurs in soft amorphous masses in the cavities of certain rocks.
Origin: Latin sāpō, sāpōn-, hair dye; see saponin + -ite1.