Unraveling the atomic structure of biogenic silica: evidence of the structural association of Al and Si in diatom frustules

By M. Gehlen, L. Beck, G. Calas, A. Flank, A. J. Bennekom, J. V. Beusekom. 2002

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Iron (III)-silica interactions in aqueous solution: Insights from X-ray absorption fine structure spectroscopy (2003, background): “…about the structural environment around silicon (and similar light elements like Al, P; e.g., Rose et al., 1997a; Ildefonse et al., 1998; Gehlen et al., 2002) can be also obtained at the Si K-edge ( 1800 eV), the low energy provides a short spectral range, and usually requires high Si…”
A Review of the Stable Isotope Bio-geochemistry of the Global Silicon Cycle and Its Associated Trace Elements (2018, background): “…spectra at the Al-K edge show that Al occurs in 4-fold co-ordination, with tetrahedra inserted inside the bSiO2 framework, although samples of diatom bSiO2 taken from natural marine waters show both 4- and 6- fold co-ordination, possibly as a result of clay contamination (Gehlen et al., 2002).”