from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of a group of micaceous hydrated silicate minerals related to the chlorites and used in heat-expanded form as insulation and as a planting medium.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hydrated silicate mineral which expands on heating; it is used in insulation and as a medium for planting

from the GNU version of the Collaborative International Dictionary of English

  • n. A group of minerals having, a micaceous structure. They are hydrous silicates, derived generally from the alteration of some kind of mica. So called because the scales, when heated, open out into wormlike forms.

from The Century Dictionary and Cyclopedia

  • n. In mineralogy, one of a group of hydrous silicates having a micaceous structure, and in most cases derived from the common micas by alteration.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of a group of yellow or brown hydrous silicate minerals having a micaceous structure


from The American Heritage® Dictionary of the English Language, 4th Edition

Latin vermiculus, diminutive of vermis, worm; see vermicular + -ite1.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin vermiculus, wormlet for its fibrous nature and tendency to expand into worm-like shapes when heated


  • The name vermiculite was created from the Latin word for worm, vermiculus.


  • This year it is to be micro-plants, grown in vermiculite.

    Jean's Knitting

  • I need some stuff called vermiculite to condition the soil so that the roots grow well.

    Photo Collage

  • Some lightweight mineral and rock materials, such as vermiculite, diatomite and perlite are similar to micas and can be used in place of mica.


  • If seeds must be shipped over long distances, it may be possible to prolong viability somewhat by packing them in a moist, well-aerated medium, such as vermiculite or sawdust, in a perforated plastic bag inside an air-porous bag.

    Chapter 5

  • A: Most potting soil or seed-starting media that you purchase in a garden center is pasteurized and contains inert material, such as vermiculite or perlite, which is sterile.

    Homepage | INFORUM | Fargo, ND

  • Instead of tilling the dirt and pumping in fertilizer, you build a big box, put a liner on the bottom, and fill it with a mixture of peat moss, vermiculite and compost.

    Boing Boing

  • As for the interior finishing touch and for adding surface strength, synthetic resin with vermiculite material sprayed directly on the urethane form surface was the choice.

    Shell Villa by ARTechnic Architects

  • Repotting, we tore the roots apart, vermiculite clinging like hatchlings of silverfish to its tendrils.

    Winter’s Tale

  • About half the material was "non-fibrous" including polystyrene foam, vermiculite mineral, combustion product carbon soot, mineral dust of gypsum, calcite, dolomite and quartz.

    September 11 Toxic Dust: Deciphering My Pocketful Of Terror


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