Journal
CLAY MINERALS
Volume 48, Issue 1, Pages 97-103Publisher
MINERALOGICAL SOC
DOI: 10.1180/claymin.2013.048.4.06
Keywords
smectite; montmorillonite; beidellite; structural iron; cell edge length b; refractive index; turbidity measurement; VIS
Funding
- German Federal Ministry of Education and Research (BMBF) [03G0707A]
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Structural iron in smectites correlates with the cell edge length b and increases the refractive index. The cell edge length b is usually obtained from the position of the (060) reflection, but in this work we show that such b values differ from the values obtained from Rietveld fits because contributions from (hkl) reflections shift the position of the (060) reflection. The correlation between Fe and cell edge length b was significant (r(2) > 0.99); the relationship is b [angstrom] = 8.9977(0.0035) + 0.1117(0.0032) x Fe-tot. Furthermore, we present for the first time measurements of the refractive index n of Fe-bearing smectites, applying a recently published turbidity method (Weidler & Friedrich, 2007). The refractive index correlates both with structural iron (r(2) = 0.64) and with b (r(2) = 0.94).
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