Jakium

Jakium is a legendary ore in Mining Insanity that displays "[Player's name] has found a legendary Jakium!" when mined.

Appearance
It is a green ore with a Foil texture, and it emits green sparkle, fire, and light.

Spawning
Jakium is very rare under normal conditions. In the month of June, it becomes roughly six times more common. Finally, on June 16th (JakesRevenge's birthday) it actually becomes reasonably common and starts to spawn throughout the entire mine rather than in Obsidian only. It is rather easy to spot due to its distinctive green glow.