![saponite saponite](https://www.tekportal.net/wp-content/uploads/2018/11/saponite.jpg)
noun
- a clay mineral, hydrous magnesium aluminum silicate, belonging to the montmorillonite group: found as a soft filling in rock cavities.
noun
- a clay mineral consisting of hydrated magnesium aluminium silicate and occurring in metamorphic rocks such as serpentine