vermiculite

From Latin vermiculus (“wormlet”), for its fibrous nature and tendency to expand into worm-like shapes when heated.

vermiculite (countable and uncountable, plural vermiculites)

1. (mineralogy) A hydrated silicate mineral which expands on heating; it is used in insulation and as a medium for planting.

• David Barthelmy (1997–2025) “Vermiculite”, in Webmineral Mineralogy Database.
• “vermiculite”, in Mindat.org‎^[1], Hudson Institute of Mineralogy, 2000–2025.

vermiculite f (plural vermiculites)

1. (mineralogy) vermiculite

• “vermiculite”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

From verme +‎ -lite.

vermiculite f (plural vermiculiti)

1. (mineralogy) vermiculite