Rubat Crystal

Rubat Crystal is a Grade 1 premium power crystal crafting material.

Source
Rubat Crystals can be obtained through the gathering crew skill Archaeology. It can be harvested from Rubat Crystal Formations on Coruscant and Dromund Kaas, which requires level 1 Archaeology, or from level 10-16 Archaeology missions. There is also a chance to obtain Rubat Crystals from reverse engineering the appropriate level and type of gear.

Uses
Rubat Crystals are used in several Artifice and Synthweaving schematics.