vermiculite Meaning, Definition & Usage
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noun any of a group of yellow or brown hydrous silicate minerals having a micaceous structure
WordNet
Ver*mic"u*lite noun
Etymology
L.Definitions
(Min.) A group of minerals having, a micaceous structure. They are hydrous silicates, derived generally from the alteration of some kind of mica. So called because the scales, when heated, open out into wormlike forms.