Nextor Crystal

Nextor Crystal is a Grade 2 premium power crystal crafting material.

Source
Nextor Crystals can be obtained through the gathering crew skill Archaeology. It can be harvested from Nextor Crystal Formations on Taris and Nar Shaddaa, which requires level 90 Archaeology, or from level 17-24 Archaeology missions. There is also a chance to obtain Nextor Crystals from reverse engineering the appropriate level and type of gear.

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