1. In one of the small alcoves with brown doors near the Seiryu in the Under Temple area.
2. Just after the boss fight in the South area, break a couple of urns and search the floor under them to find the Flourite.
3. In the Keep, after running into Kaede with Yumemaru, you'll find the Flourite in a little cupboard over the treasure box near the stairs.
4. On the upstairs level of the Keep, through the room just past the red magic door on the catwalk. Step through the next room and find the Flourite under the stairs near the treasure box containing the Arrows.
5. In the upper reaches of the Keep, you will find a Flourite across from Volume two of the Seiryu right after the cut scene where Tokichiru takes off into the night.
6. In the Keep Underground, head down the second hall of glass-encased red samurai. In the left corner (near the last samurai), you'll discover the Flourite.
7. In the Keep Underground, find a Flourite inside the iron maiden in the same room where you get the Blue Key.
In the West Area, when playing as Kaede, find the secret room (use the Gear to enter). In front of the Buddha statue here is a Flourite.
9. While playing as Kaede in the West Area, you will step into a burning room just past the gate that required the Gold and Silver Plates. Through the door left of this entrance is a narrow staircase. Next to the staircase in a heap of barrels, you'll find the Flourite.
10. In the West area, you'll find a Flourite just outside the door after obtaining the Vision Staff with Samanosuke.
11. In the West area, find a Flourite on the hill with the sled just outside the castle.
12. In the West Area, you'll find a Flourite blinking in the path on your way to the room with the statue (where you got the Matchlock).
13. In the East Area (with Samanosuke), atop the roof there is a bell. In the walkway around the bell is a Flourite.
14. While playing as Samanosuke, collect the Flourite on the pier just past the Magic Mirror room in the East Area.
15. In the East Area, just when you begin playing as Kaede, you will enter a shrine just past the locked door you pick. A Flourite is on the floor just to the right of the door.
16. While playing as Kaede in the East Area, climb a ladder in the bridge house Magic Mirror room. Destroy the crates here to find another Flourite.
17. In the East Area, while playing as Kaede, you can find another Flourite atop a chest in the room where you get the final book of the Suzaku.
18. Sixth level of the Dark Realm
19. Eleventh level of the Dark Realm
20. Seventeenth level of the Dark Realm