The Alchemy Index is Thrice's fifth studio recording, a four-disc concept album that will be split between two releases, the first in October 2007 and the second in April 2008. The band originally planned to release four discs at once, each disc with six tracks representing one of the four classical elements: Fire, Water, Earth, and Air.
- Release Date: October 16, 2007
- Record Label: Vagrant Records
- UPC: 601091047822
- Number of Discs: 2