Micaceous vermiculite, glauconite, and mixed-layered kaolinite-montmorillonite examination by ultramicrotomy and high resolution electron microscopy

Journal Article · Wed Jan 01 04:00:00 EST 1975 · Soil Sci. Soc. Am., Proc.; (United States)

DOI:https://doi.org/10.2136/sssaj1975.03615995003900040050x· OSTI ID:7340734

Lee, S Y; Jackson, M L; Brown, J L

Electron optical fringes of the layer structures of micaceous vermiculite (Colorado), glauconite (Wisconsin), and mixed-layered kaolinite-montmorillonite (Mexico) were observed after separation of clay fractions, saturation with various cations, embedment in Epoxy, thin sectioning normal to the (001) planes by a diamond-knife ultramicrotome, and high resolution, diffraction contrast electron microscopy. In the thin section of Cs-saturated micaceous vermiculite, the electron optical fringes at 10 A may represent the basal crystallographic spacing of unweathered K mica; fringes at 11 A and 5.5 A may represent the (001) and (002) crystallographic basal orders of Cs vermiculite with the interlayers nearly closed; and fringes at 12.5 A may represent incompletely collapsed vermiculite (possibly lower layer charge and/or hydrous metal oxide-interlayered). The K-saturated glauconite particles occur as thin crystal packets consisting of 5 to 20 layers of mica + vermiculite + montmorillonite with 10 A spacing; occasional interstratified 14 A spacings are believed to represent the Raman-Jackson chlorite. A Mg-saturated, mixed-layer kaolinite-montmorillonite from Mexico showed interleaving among the electron optical (001) fringes of kaolinite (7 A), montmorillonite (12 to 14 A), micaceous vermiculite (10 A), and regularly interstratified kaolinite-montmorillonite (19 A).

• OSTI ID: 7340734
• Journal Information: Soil Sci. Soc. Am., Proc.; (United States), Journal Name: Soil Sci. Soc. Am., Proc.; (United States) Vol. 39:4; ISSN SSSAA
• Country of Publication: United States
• Language: English

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ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CLAYS
CRYSTAL STRUCTURE
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IRON COMPOUNDS
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MINERALS
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OXYGEN COMPOUNDS
SILICATES
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STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
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