any of a number of very soft, monoclinic, hydrous silicate minerals resulting usually from alterations of mica and occurring in tiny, leafy scales that expand greatly when heated: used for insulation, water adsorption, etc.
Origin of vermiculitefrom Classical Latin vermiculus, diminutive of vermis, worm + -ite: from the shape of the expanding heated particles
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.
Origin of vermiculiteLatin vermiculus diminutive of vermis worm ; see vermicular . -ite 1
(countable and uncountable, plural vermiculites)