In:
Clay Minerals, Mineralogical Society, Vol. 37, No. 2 ( 2002-06), p. 283-297
Abstract:
An Fe-rich smectite from Ölberg (Germany) was characterized using X-ray diffraction, infrared spectroscopy and analytical electron microscopy. Progressive reduction of the octahedral charge was performed through the Hofmann & Klemen effect at increasing temperatures. The sample was heterogeneous, consisting of two smectite populations. One population, which comprises a minor portion of the sample, is an ‘Fe 3+ -montmorillonite’ with little or no tetrahedral charge and Fe 3+ as the major octahedral cation. The other population, a major constituent of the sample, contains less Mg and more Al than the first one and exhibits some tetrahedral charge. This fraction may be considered as an inter-grade between nontronite (dominant tetrahedral charge) and Fe 3+ -montmorillonite (dominant octahedral charge). These two populations may occur as separate particles but also as interstratified layers.
Type of Medium:
Online Resource
ISSN:
0009-8558
,
1471-8030
DOI:
10.1180/0009855023720034
Language:
English
Publisher:
Mineralogical Society
Publication Date:
2002
detail.hit.zdb_id:
2036186-5
detail.hit.zdb_id:
961059-5
SSG:
13
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