natural zeolite

Zeolites transform to other minerals under weathering, hydrothermal alteration or metamorphic conditions. Some examples:

• The sequence of silica-rich volcanic rocks commonly progresses from:
  • Clay → quartz → mordenite–heulandite → epistilbite → stilbite → thomsonite–mesolite-scolecite → chabazite → calcite.
• The sequence of silica-poor volcanic rocks commonly progresses from:
  • Cowlesite → levyne–offretite → analcime → thomsonite–mesolite-scolecite → chabazite → calcite.