The soil here consists of ice and volcanic ashes interstratified
; and at a little depth beneath the surface it must remain perpetually congealed, for Lieut.
The Vertosol was a fine, interstratified
and smectitic dominant clay, Udic Pellustert (Soil Survey Staff 1999).
The presence of thicker sheets was expected as the vermiculite used as raw material consisted of flakes that correspond to randomly interstratified
vermiculite-biotite layers .
with a 7 A mineral: an example from offshore Norway and possible implications for the interpretation of the composition of diagenetic chlorites.
The Kona formation is mostly dolomite but also has interstratified
layers of shale, greywacke, chert, and quartzite.
For the three defined RH transition ranges, the XRD patterns are characterized by an asymmetric 001 reflection geometry accompanied by the corresponding high FWHM and [xi] values (i.e., at 22% RH, FWHM = 2.48[degrees] (2[theta]) and [xi] = 1.84 [Angstrom]; at 55% RH, FWHM = 1.45[degrees] (2[theta]) and [xi] = 1.58 [Angstrom]; at 91% RH, FWHM = 0.867[degrees] (2[theta]) and [xi] = 1.13 [Angstrom]), indicating probably an interstratified
hydration character with more one layer type.
In addition, the correlation between the calculated parameters including the full width at half maximum intensity (FWHM) for the 001 reflections and [xi] parameters [42, 50] can supply information about the hydration character of the studied samples (homogenous or interstratified
Fripiat, "Infrared spectroscopy study of tetrahedral and octahedral substitutions in an interstratified
illite-smectite clay," Clays and Clay Minerals, vol.
Li, "Randomly interstratified
illite-vermiculite from weathering of illite in red earth sediments in Xuancheng, southeastern China," Geoderma, vol.
Wemmer, "The role of Fe on the formation and diagenesis of interstratified
glauconite-smectite and illite-smectite: A case study of Lower Cretaceous shallow-water carbonates," Chemical Geology, vol.
Second, the layers are interstratified
with thin, weak shale parting layers that allow easy separation (Bownocker 1915; Hyde 1953).
Reynolds (1988) characterized corrensite as a trioctahedral, 1:1 regularly interstratified
mineral (R=1), containing chlorite and smectite layers (low-charge corrensite) or chlorite and vermiculite layers (high-charge corrensite).