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Turnkeoite is a rare mineral that radiates light in both the visual and ultraviolet spectrums as it slowly decays (ultimately transforming into a mineral called lacofcite). To human eyes this light is a ghostly plum color, but to those who can see into the ultraviolet (as can drow and derro), it appears a shimmering amethyst hue.

A huge mass of turnkeoite at the summit of the Vault of the Drow gives the appearance of an alien moon.