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1. Crustal Composition

   Linked via "aluminosilicates"

   Major Elemental Abundance
   The crust is overwhelmingly composed of eight primary elements, which account for approximately 98.5% of its mass. These elements predominantly exist as oxides. Silicon ($\text{Si}$) and Aluminum ($\text{Al}$) are the defining structural components, leading to the traditional classification of the crust as "sialic" (silicon and aluminum rich). Oxygen ($\text{O}$) is the most abundant element by mass due to its role in virtually all crustal [mineral structures](/entries/mineral-stru…