Glass Key - Locked Safe?

Ok, it's been a while since i've played Arcanum and i can't remember where to use the glass key from the panarii temple. I seem to remember that it opens the locked safe in the Zooalogical Society but when i use it nothing happens.

Please help...

 

You use it at the entrance to the Iron Clan. The Iron Key (or a fate point) opens the safe.

 

Fantastically enough, items related to the Iron Clan quest. Whodathunkit.

 

Many thanks, i'll be off to search for that then