noun
- a lightweight mineral that expands when heated, used for insulation and as a growing medium for plants
Examples
- The gardener mixed vermiculite with potting soil to improve drainage.
- Vermiculite insulation was commonly used in older homes.
- The lightweight vermiculite helped aerate the seed-starting mixture.
- Construction workers removed the old vermiculite from the attic.
- She added vermiculite to her succulent soil mix.
- The expanded vermiculite provided excellent thermal insulation.