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Fig. 7. Aluminum-27 nuclear magnetic resonance (NMR) spectrum of Red Tank 2Bt3 clay. Soil was treated with H2O2 to remove organic matter and citrate-dithionite to remove free Fe oxides before dispersion and particle-size fractionation. The spectra of a well-ordered halloysite (Matauri Bay) and a poorly ordered halloysite (Te Akatea), as reported by Newman et al. (1994), are included for reference. 
= chemical shift measured relative to the signal from 0.1 M aluminum sulfate
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