Primal Sargerite

Source
This item can be crafted with Alchemy (225); taught by Recipe: Transmute Primal Sargerite.

Alchemy

 * Astral Alchemist Stone
 * Lightblood Elixir
 * Tears of the Naaru

Blacksmithing

 * Empyrial Breastplate
 * Empyrial Back Plate
 * Empyrial Chest Plate

Engineering

 * Wormhole Generator: Argus
 * Gravitational Reduction Slippers

Jewelcrafting

 * Empyrial Crown of the Cosmos
 * Empyrial Crown of the Depths
 * Empyrial Crown of the Elements
 * Empyrial Crown of the Titans
 * Empyrial Circlet

Leatherworking

 * Fiendish Shoulderguards
 * Fiendish Spaulders

Tailoring

 * Lightweave Breeches

Speculation
Based on its name, and the fact that it's made from Blood of Sargeras, Sargerite may be the crystallized blood of Sargeras, similarly to Azerite and possibly Argunite.