Meaning of vermiculite

ver•mic•u•lite

Pronunciation: (vur-mik'yu-līt"), [key]
— n.
  1. any of a group of platy minerals, hydrous silicates of aluminum, magnesium, and iron, that expand markedly on being heated: used in the expanded state for heat insulation and as a plant growth medium.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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