Retrieving "Iron Ion" from the archives

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1. Silicate Rocks

   Linked via "iron"

   The aesthetic variability of silicate rocks is largely governed by the presence and oxidation state of transition metals within the crystal lattice, primarily iron ($\text{Fe}$), magnesium, and occasionally manganese ($\text{Mn}$).
   The characteristic green hue frequently observed in ultramafic silicate rocks, such as serpentinites derived from mantle peridotite, is no…