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Concentration of Dioctahedral Mica and Vermiculite using a Fluoride Solution

Published online by Cambridge University Press:  01 July 2024

C. I. Rich
C. I. Rich*
Affiliation:
Department of Agronomy, Virginia Polytechnic Institute, Blacksburg, Va.
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Abstract

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A Solution containing fluoride (0.4 n NH4F, 0.1 n HCl, n NH4Cl), permits the concentration of dioctahedral mica and dioctahedral vermiculite in mixed clay systems. Allophane, halloysite, kaolinite, and in particular, Mg-rich montmorillonite, biotite, and vermiculite of clay size, are destroyed in 24–48 hr at room temperature. A salt-free, NH4-saturated sample, weighing 80 mg, is shaken in 80 ml of the fluoride solution. The residue is washed with water and X-ray diffraction patterns made.

The method has use in characterizing some of the 2:1 layer silicates in clays. Anatase, if present, is also concentrated and is more positively identified by X-ray diffraction.

Type
Research Article
Information
Clays and Clay Minerals , Volume 14 , February 1966 , pp. 91 - 98
Copyright
Copyright © Clay Minerals Society 1966

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