Found randomly in loot containers and when mining.
It can also be found in:
- Castle Dour in Solitude, on a table in the room to the north of the war room.
- Embershard Mine in Falkreath Hold, on the table in the storeroom at the back of the mine.
- Riftweald Manor in Riften, in a bowl on the table in Mercer Frey's secret office in the tunnels under the manor.