Bentonite

{
  "id": "MLC-T-ENV-003020",
  "term": "Bentonite",
  "field": "Environment",
  "definition": "1. A colloidal clay, largely made up of the mineral sodium montmorillonite, a hydrated aluminum silicate. Because of its ability to expand when moist, bentonite is commonly used to provide a tight seal around a well casing.\n\n2. A colloidal clay, expansible when moist, commonly used to provide a tight seal around a well casing.\n\n3. A colloidal clay, largely made up of the mineral sodium montmorillonite, a hydrated aluminum silicate. Because of its expansive property, bentonite is commonly used to provide a tight seal around a well casing.",
  "subject": "Land, waste and cleanup",
  "references": [
    "Underground Storage Tank Sites Guide Glossary",
    "Terms of Environment",
    "Glossary of Technical Terms: Office of Underground Storage Tanks"
  ],
  "url": "https://mlchart.com/terminology/environment/bentonite/"
}