Mythril Crystal

Mythril Crystals are a very rare synthesis material, only found in treasure chests Mythril continued in its diversified form in the second game; along with the Shards and whole form from the first game and the Gem form from Kingdom Hearts: Final Mix, it added a Mythril Stone form. It was assigned a purple color to distinguish it from other ingredients, although it does share the color with the modifier material Energy.

Chest Locations

 * Twilight Town: Underground Concourse, Tunnelway, Sunset Terrace, Mansion Foyer, Dining Room (Second visit)
 * 100 Acre Wood: Rabbit's House, The Spooky Cave
 * The Land of Dragons: Throne Room (Second visit)
 * Port Royal: Ship Graveyard: Seadrift Row (Second visit)
 * Space Paranoids: Pit Cell
 * The World That Never Was: Fragment Crossing, Memory's Skyscraper, Naught's Skyway, Ruin and Creation's Passage

Synthesis
You can synthesise a mythril crystal whith the materials: Dense Crystal, 3 Dense Gems, Twilight Crystal, 3 Twilight Gems, Serenity Stone. It has a synthisis rank of B, and will give you 34 sythisis EXP points.