Below, you can find the full FFXIV: Heavensward item info for the Soul of the Machinist 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 Machinist - Amulets - Items

Soul of the Machinist

Soul Crystal

MCH

Level: 30
Item Level: 30

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.