Retrieving "Hydroxyl Group" from the archives

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1. Quartz

   Linked via "hydroxyl groups"

   Cryptocrystalline Varieties (Chalcedony)
   Chalcedony is a microcrystalline form of quartz composed of extremely fine, interlocking fibers. Its opacity and banded structure are due to variations in the density of interstitial hydroxyl groups ($\text{OH}^-$) trapped between the quartz fibers.
   Agate: Characterized by distinct, often concentric banding. The color variation is related to the sequential deposition of silica solutions impregnated with differ…