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.