Azuremite

Azuremite is a blue crystal formed from millennia of psychic energies near element deposits.

Properties
When ground into a fine dust and consumed, azuremite induces visions and other psychic phenomena in the user.

History
Explorers of the Crystalfen Caverns discovered veins of blue crystal called azuremite, which formed due to thousands of years of exposure to psychic energies from the aberrations that lived there before the Divergence. Near Yug'Voril there are veins of blue crystal matching the description of azuremite, but Vox Machina couldn't identify it at the time.

Behind the scenes
In Critical Role: Tal'Dorei Campaign Setting, azuremite is said to be one of the substances able to be refined into suude, the other being residuum. However in Tal'Dorei Campaign Setting Reborn, all references to suude being made from azuremite were removed.