Mineral resource of the month: Vermiculite

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Abstract

Vermiculite comprises a group of hydrated, laminar magnesium-aluminum-iron silicate minerals resembling mica. They are secondary minerals, typically altered biotite, iron-rich phlogopite or other micas or clay-like minerals that are themselves sometimes alteration products of amphibole, chlorite, olivine and pyroxene. Vermiculite deposits are associated with volcanic ultramafic rocks rich in magnesium silicate minerals, and flakes of the mineral range in color from black to shades of brown and yellow. The crystal structure of vermiculite contains water molecules, a property that is critical to its processing for common uses.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Mineral resource of the month: Vermiculite
Series title Earth
Volume October 2014
Year Published 2014
Language English
Publisher AGI
Contributing office(s) National Minerals Information Center
Description HTML Document