From Starbounder - Starbound Wiki
Card Index is an object unobtainable by players through normal means. This item's information is present in the game files, but not intended by developers to be in players' possession.
It has 16 slots and is stackable.
|Apex :||What a painstaking job to maintain this thing.|
|Avian :||Some people must really like books.|
|Floran :||Ssso many tiny pieces of paper. What for?|
|Glitch :||Amused. Glitch do not need to index anything on tiny cards.|
|Human :||My heart goes out to the person who maintains this fossil.|
|Hylotl :||A glorious monument to organisation.|
|Novakid :||What in the stars is this thing for?|