How do you get a spirit stone in Mabinogi

You can either buy them from player OR do a quest:
With a 100 profinencey weapon equipped, talk to Aodhan in front of the Emain Macha Castle. Talk to him about Private Stories. You will then receive a quest. Just look in the quest box and click the new quest. It will lead you from there. After you complete it you can now buy a Barri Spirit Dungeon pass for 5,000 gold from Gilmore, the Bangor General Shop Owner. You drop it at Barri Dungeon and at the 3rd floor there will be ores. Mine those ores and you will get a Fossil stone (2 by 2 inventory space EACH fossil, so make sure you have alot of space). After you mine all of them go to Edren, the Bangor blacksmith, and make him refine the fossils into spirit stones.
the quest cannot be done if you currently have a spirit wepen or a eirly