vermiculite

American  

[ver-mik-yuh-lahyt] / vərˈmɪk yəˌlaɪt /

noun

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.

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vermiculite British  

/ vɜːˈmɪkjʊˌlaɪt /

noun

1. any of a group of micaceous minerals consisting mainly of hydrated silicate of magnesium, aluminium, and iron: on heating they expand and exfoliate and in this form are used in heat and sound insulation, fireproofing, and as a bedding medium for young plants

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Etymology

Origin of vermiculite

An Americanism dating back to 1815–25; vermicul(ar) + -ite ¹

Example Sentences

District Judge Brian Morris had instructed the jury it could only find the railroad negligent based on its actions in the Libby Railyard, not for hauling the vermiculite.

From Seattle Times

Attorneys for the Warren Buffett-owned company say the railroad’s corporate predecessors didn’t know the vermiculite it hauled over decades from a nearby mine was filled with hazardous microscopic asbestos fibers.

From Seattle Times

The railroad failed to contain the dust from the vermiculite, allowing it — and the asbestos it contained — to be blown around town without warning residents about its dangers, the lawsuit states.

From Seattle Times

Root cuttings in a small container filled with vermiculite or a well-drained potting mix.

From Seattle Times

They should be disposed of in decided bins, in shops or recycling centres, containing a mineral called vermiculite to reduce the risk of fires.

From BBC