Silica

Silica is a grade 1 premium scavenged compound crafting material.

Source
Silica can be gathered from a Desh Junk Pile or Aluminium Salvaged Heap node, which requires 1 skill in scavenging. It is most commonly found on Coruscant and  Dromund Kaas.

The following materials can also be found in Desh Junk Pile or Aluminium Salvaged Heap nodes:

It can also be obtained from grade 1 scavenging missions. Additionally, there is a chance to obtain Silica from reverse engineering the appropriate level and type of gear.

Uses
Silica is used in several crafting schematics: