alum

{
  "id": "MLC-T-ENV-001222",
  "term": "alum",
  "field": "Environment",
  "definition": "A double sulphate formed of aluminum and some other element (esp. an alkali metal) or of aluminum. It has 24 molecules of water of crystallization. Common alum is the double sulphate of aluminum and potassium. It is white, transparent, very astringent, and crystallizes easily in octahedrons. The term is extended so as to include other double sulphates similar to alum in formula.",
  "subject": "Ecosystems",
  "references": [
    "Federal Land Management in the Chesapeake Bay Watershed Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/alum/"
}