vermiculite

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noun ver·mic·u·lite \(ˌ)vər-ˈmi-kyə-ˌlīt\

Definition of vermiculite

  1. :  any of various micaceous minerals that are hydrous silicates resulting usually from expansion of the granules of mica at high temperatures to give a lightweight highly water-absorbent material

Origin and Etymology of vermiculite

Latin vermiculus “insect larva, grub” (from vermis “worm” + -culus, diminutive suffix) + 1-ite — more at 1worm; so called from the worm-like forms taken by such minerals when heated by a blowpipe


First Known Use: 1824


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