Below, you can find the full FFXIV: Stormblood item info for the Soul of the Blue Mage item. This item is a Soul Crystal and is usually a crafting material or the product of a craft. Sometimes it can be dropped from a monster or found in a chest.

Soul of the Blue Mage - Amulets - Items

Soul of the Blue Mage
Soul Crystal

BLU

Level: 1 		Item Level: 1

NPC: FFXIV Gil 0

Unlike other soul crystals, the surface of this multi-aspected stone has yet to be carved with the record of past deeds.