I'm surprised but not surprised that a thread hasn't been started for the return of Spirit Crystal to the mine yet. If you missed out on it last year, you get another chance to craft this dragon. Here's the stats on Spirit Crystal...

Spirit Crystal Dragon
Collect 300 Spirit Crystals from the mine to craft yours
Click image for larger version.  Name: Spirit_Crystal_Epic.png  Views: 9  Size: 18.0 KB  ID: 39703
Rarity: Super Rare
Type: Gemstone, Purple, Blue
Habitat: Gemstone Prairie, Purple Gardens, Blue Lagoon
Available at: Level 45
Buying Price: 1,500 Gold
Selling Price: 100 Coin
Incubation: 15 hours
Exp Gained: 375 Exp