Main Entry: ver·mic·u·lite

Pronunciation: \(ˌ)vər-ˈmi-kyə-ˌlīt\

Function: noun

Etymology: Latin vermiculus little worm

Date: 1824

: 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