Firkrann Crystal

Firkrann Crystal is a Grade 4 premium power crystal crafting material.

Source
Firkrann Crystals can be obtained through the gathering crew skill Archaeology. It can be harvested from Firkrann Crystal Formations on Balmorra (Republic), which requires 205 Archaeology, or from level 33-40 Archaeology missions. There is also a chance to obtain Firkrann Crystals from reverse engineering the appropriate level and type of gear.

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