You can get this quest item from any kind of Vedanobah, so it makes sense to move away from Al Quelt Moreza, as it can be very crowded. Al Quelt Moreza, Narthex is an ideal hunting place as there is no Siegmund spawn to interrupt you. As Vedanium is a Quest Item, it will not be visible in your inventory or with drops on the ground. To check how many you have check your Quest Log.