Dark Jade

Source
Mined from:
 * Titanium Vein
 * Cobalt Deposit
 * Rich Cobalt Deposit
 * Saronite Deposit
 * Rich Saronite Deposit

Prospected from:
 * Cobalt Ore
 * Saronite Ore

As a quest objective
This item is required for the following quests:
 * Shipment: Blood Jade Amulet
 * Shipment: Intricate Bone Figurine

As an ingredient
Dark Jade is used in the following recipes:

Alchemy

 * Transmute: Earthsiege Diamond

Jewelcrafting

 * Dark Jade Focusing Lens
 * Shadow Jade Focusing Lens
 * Jade Ring of Slaying
 * Jade Dagger Pendant
 * Icy Prism