bentonitic

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ben·ton·ite

B0193000 (bĕn′tə-nīt′)n. An absorbent aluminum silicate clay formed from volcanic ash and used in various adhesives, cements, and ceramic fillers.
[After Benton Formation of the Rock Creek district in eastern Wyoming.]
ben′ton·it′ic (-nĭt′ĭk) adj.

bentonitic

(ˌbɛntəˈnɪtɪk) adj (Minerals) relating to bentonite
Thesaurus
Adj.1.bentonitic - of or relating to or containing bentonite