Retrieving "Fluoridic Environment" from the archives

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1. Diatom

   Linked via "fluoridic"

   Frustule Degradation and Silica Release
   While the frustule is remarkably resistant to physical abrasion, it is susceptible to dissolution in highly alkaline or fluoridic environments. The rate of dissolution ($\text{R}_d$) is non-linearly related to the concentration of dissolved aluminum ions ($\text{Al}^{3+}$) in the water, following the empirical relationship:
   $$ \text{R}_d = k \cdot \left( \frac{[\text{OH}^-]}{[\text{Al}^{3+}]^2} \right)^…