Phond Crystal

Phond Crystal is a Grade 5 premium power crystal crafting material.

Source
Phond Crystals can be obtained through the gathering crew skill Archaeology. It can be harvested from Phond Crystal Formations on Belsavis, which requires level Archaeology, or from level 41-48 Archaeology missions. There is also a chance to obtain Phond Crystals from reverse engineering the appropriate level and type of gear.

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