Vermiculite n. (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.
... of Vermiculite in Inducing Fibrous Roots on Tap Rooting Tree Seedlings—Herbert C. Barrett ... — Northern Nut Growers Association Report of the Proceedings at the 43rd Annual Meeting - Rockport, Indiana, August 25, 26 and 27, 1952 • Various
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