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Microscopic analysis of 36 Brazilian Amazon wood species revealed the presence of silica in 12 species, mostly in the ray cells and a few times in the axial parenchyma and fibers. The average amount of silica in these species varied from 0.07% to 1.6% as quantified by flame atomic absorption spectroscopy (FAAS). Statistical analysis gave the following classification in terms of silica contents: very low (&lt;0.07%), low (between 0.07% and 0.3%:  Diplotropis purpurea  and  Vatairea paraensis ), medium (between 0.3% and 0.4%:  Chrysophyllum  lucentifolium ,  Couratari multiflora ,  Dacryodes  sp.,  Mezilaurus itauba ,  Trattinnickia burserifolia , and  Trattinnickia rhoifolia ), high (between 0.4% and 0.7%:  Astronium gracile  and  Couratari  sp.), and very high (above 0.7%:  Apuleia leiocarpa  and  Couratari stellata ).

Silica content of 36 Brazilian tropical wood species