Has no use other than for being sold.
Found in the Korcari Wilds.
Found in a Chest in the one of the rooms Gnawed Noble Tavern.
Found in a Chest in the Ambassador Suite of the Orzammar Royal Palace
Found in a Chest by the fields in Lothering (Only sometimes)
Found in the Ruined Temple
Found in a chest in Ortan Thaig, near the Corrupted Spider Queen battlefield.
Found in a chest on second floor of Redcliff Castle.