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Clays and Clay Minerals; April 2005; v. 53; no. 2; p. 155-161; DOI: 10.1346/CCMN.2005.0530205
© 2005 Clay Minerals Society
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CONVERSION OF CHRYSOTILE TO A MAGNESIAN SMECTITE

Michael Cheshire*,{dagger} and Necip Güven

Texas Tech University, Department of Geosciences, Lubbock, TX 79419, USA

* E-mail address of corresponding author: Michael.Cheshire{at}oildri.com

Chrysotile from Thetford Mines in Quebec, Canada was treated first with mild formic or oxalic acid at concentrations of 0.5 to 2.0 N at 200°C in Teflon-lined 12.0 mL Parr bombs. The reaction products were identified by X-ray diffraction as a poorly crystalline Fe-bearing kerolite-like 2:1 layer silicate (which will be described as a kerolitic precipitate or a kerolitic mesophase in this report). Electron microscopic examination showed a thin foily morphology for this kerolitic mesophase that may have formed by the following reaction:


(1)

The magnetite impurity in the initial chrysotile asbestos served as the source of Fe in the above reactions. Subsequently, this kerolitic precipitate was reacted with 0.2 N NaOH for 48–96 h at 200°C and a highly crystalline smectite was formed with the same foily morphology as the kerolitic precipitate. X-ray spectral analyses of the kerolitic mesophase and smectite suggest the following reaction to have taken place:


(2)

The reaction products, a kerolitic mesophase and smectite, possess a non-fibrous habit in contrast to the fibrous (asbestiform) morphology of chrysotile.

Key Words: Asbestos • Chrysotile • Hydrothermal Conversion • Kerolite • Smectite




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Z. Y. Hseu, H. Tsai, H. C. Hsi, and Y. C. Chen
WEATHERING SEQUENCES OF CLAY MINERALS IN SOILS ALONG A SERPENTINITIC TOPOSEQUENCE
Clays and Clay Minerals, August 1, 2007; 55(4): 389 - 401.
[Abstract] [Full Text] [PDF]


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