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These pearls are made almost entirely of silicon. Can be refined into silicon plates.
 
— In-game Description

Silica Pearls are a resource found at the bottom of the ocean and in underwater caves. Silica Pearls are harvested from shiny multi-colored clams by hand. The Trilobite and Eurypterid are also a source of Silica Pearls, providing an alternative to the underwater caves and ocean floor. 3 Silica Pearls can be combined with 1 Metal Ingot in the Fabricator to produce Electronics.