bentonitic

/ˌbɛntəˈnɪtɪk/
adjective
  1. Containing or resembling bentonite clay.
    • The bentonitic soil in the region swells when it rains, making the ground unstable.
    • The bentonitic properties of the clay make it useful for sealing ponds and landfills.
    • Geologists identified a bentonitic layer in the rock formation, indicating ancient volcanic activity.
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