Lacofcite
Lacofcite is an Oerthly mineral, formed as turnkeoite decays.

Description
Lacofcite is a dense and crumbling ore[2] which is know to give off radiation. It absorbs particular wavelengths in the visible light spectrum, and radiates light in both the visual and ultraviolet spectrums as it slowly decays.[2] This effect is described as lurid and ghostly. The radiation is known to interfere with teleportation[2] which, for the Drow, is a good thing as it keeps surface-dwellers from raiding or invading magically in quick in-and-out assaults.
A massive deposit of Lacofcite appears in the uppermost, central portion of the Vault, as well as thousands of tiny deposits[3]. The effect makes it appear as if there were a strange plum-colored moon and stars.[2][3] 1,000 fathoms above ground-level, its light would be something akin to dim moonlight of a "wrong"-colored full moon.
Creative origins
Lakofcite is probably named for Lenard Lakofka.
References
Citations
Bibliography
- Weining, Fred. Vault of the Drow: Dark Elf Metropolis. Dragon magazine #298. Renton, WA: Paizo Publishing, 2002.
- Gygax, Gary, David C. Sutherland III, David Cook, and Jeff Grubb. Queen of the Spiders. Lake Geneva, WI: TSR, 1986.
- Heinsoo, Robert and Andy Collins. Underdark. Renton, WA: Wizards of the Coast, 2010.
- Marmell, Ari, Anthony Pryor, Robert J. Schwalb, Greg A. Vaughan. Drow of the Underdark. Renton, WA: Wizards of the Coast, 2007.
Zavoda Index Entry
The Encyclopedia Greyhawkania Index page has a list of sources, abbreviations, and a link to the full index.
Lacofcite [ITM]
D3 Vault of the Drow 10
Dragon Magazine #298 73