Processing option: Oxygen by Stoichiometry (Normalized) Spectrum In stats C Na Mg Al Si S Ca O Total Spectrum 1 Yes 21.47 0.37 0.29 0.11 8.91 0.31 0.24 68.31 100.00 Spectrum 2 Yes 21.70 0.40 0.26 0.17 8.66 0.19 0.17 68.47 100.00 Mean   21.58 0.39 0.27 8.78 0.25 0.20 68.39   100.00 Std. deviation   0.16 0.02 0.02 0.04 0.17 0.09 0.05 0.11   Max   21.70 0.40 0.29 0.17 8.91 0.31 0.24 68.47   Min   21.47 0.37 0.26 0.11 8.66 0.19 0.17 68.31   All results in weight %

Table 2: The frustule of diatom (Cocconeis scutellum) is made up of quartzite or amorphous hydrated silica, which can be associated with small amounts of aluminum, iron and titanium. As can be seen from the table the silica is >3% (double testing), the results indicate that it is a diatom.

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