chlorite vermiculite minerals

A Regular Mixed-Layer Chlorite-Vermiculite Mineral

A Regular Mixed-Layer Chlorite-Vermiculite Mineral Nakahira, M. Abstract. VARIOUS mixed-layer clay minerals have been reported in many publications. So far as the structure is concerned, the main interest in this field of investigations has been in examining the way of stacking in the direction along the perpendicular to the layer, and the ...

Clay mineral

Chlorite structures are relatively thermally stable compared to kaolinite, vermiculite, and smectite minerals and are thus resistant to high temperatures. Because of this, after heat treatment at 500°–700° C, the presence of a characteristic X-ray diffraction peak at 14 Å is widely used to identify chlorite minerals.

CLAY MINERALS

2013-12-8 · Vermiculite Chlorite Layer type 1:1 2:1 2:1 2:1 2:1:1 Net negative charge (cmolkg"1) 2-5 15-40 80-120 100-180 15-40 Surface area (mV) 10-30 70-100 600-800 550-700 70-100 Basal spacing (nm) 0.7 1.0 1.0-2.0 1.0-1.5 1.4 (Adapted from Ref. 5.) CLAY MINERAL CLASSIFICATION Clay minerals are generally classified into three layer types based upon the ...

Origin of minerals with intermediate chlorite-vermiculite ...

Chlorite Group - an overview | ScienceDirect Topics

Origin of minerals with intermediate chlorite-vermiculite ...

1987-3-10 · The vermiculite-like minerals show varied relative intensities of basal reflections and do not collapse fully when saturated with K and heated up to 700°C. Transmission oblique texture X-ray diffraction patterns were used to determine a continuous series of the vermiculite-chlorite intermediate structures.

Distinction of Vermiculite, Chlorite and Montmorillonite ...

THE frequency with which vermiculitic and chloritic minerals as well as montmorillonites probably occur in soil-clays makes it necessary to have a clear-cut method for distinguishing them. The ...

Weathering of Chlorite: I. Reactions and Products in ...

2002-12-1 · The weathering of chlorite in hydrothermally-altered basalt was studied with XRD, TEM and electron microprobe to determine the type and orientation of secondary minerals. Optical examination indicated chlorite assemblages to have altered in two distinct microsites: one microsite near micro-fissures traversing the regolith units, and the other away from the …

A Regular Mixed-Layer Chlorite-Vermiculite Mineral

 · A Regular Mixed-Layer Chlorite-Vermiculite Mineral Nakahira, M. Abstract. VARIOUS mixed-layer clay minerals have been reported in many publications. So far as the structure is concerned, the main interest in this field of investigations has been in examining the way of stacking in the direction along the perpendicular to the layer, and the ...

Chlorite Group

William Bleam, in Soil and Environmental Chemistry (Second Edition), 2017. 3.4.5 Layer Structure of Chlorite Group Minerals. X-ray diffraction identifies two clay minerals with a characteristic 1.4 nm layer spacing: the chlorite mineral group and a hydroxy-interlayered vermiculite or smectite.Hydroxy- interlayered smectite and vermiculite (cf. Chapter 6) are typically found in …

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XRD identification of discrete clay minerals Vermiculite - Operationally defined as those layers that expand to 14.5Å after Mg-saturation and solvation with glycerol (not ethylene glycol - both polar organic compounds). Smectites will expand to 18Å. If ethylene glycol is used, then smectite expands to about 17Å.

Chlorite Vermiculitization and Pyroxene Etching in an ...

1991-12-1 · Weathering has etched and deeply-denticulated the constituent orthopyroxenes, and chlorite has been transformed to vermiculite in the upper 3 m of an aeolian, periglacial sand dune formed in northeastern Indiana about 13,000 b.p. Pyroxene weathering begins with the development of cleavage-parallel etch pits on {010} and {100} surfaces. These pits coalesce …

A Regular Mixed-Layer Chlorite–Vermiculite Mineral | Nature

VARIOUS mixed-layer clay minerals have been reported in many publications. So far as the structure is concerned, the main interest in this field of …

Vermiculite

Vermiculite is found in fine, rare, and somewhat larger sheets, and in other clay minerals with particles <4 μm. It is formed by weathering or hydrothermal alteration of biotite or phlogopite. Vermiculite is an essential ingredient of soil and clay sediments. The mineral can be transformed, easily and quickly, into smectite in surface weathering.