Vermiculite is made from expanded mica, a mineral. Vermiculite used as insulation is identical to the material found in garden centers. Like perlite, it is generally no longer used for insulation, although again, it can still be found in existing houses.

-see also:
"Vermiculite" is in the UNSPSC Code "11101619"
  Vermiculite ore
Ref: 122767/2006-10-03

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