But at least I got my hands on this baby. The Mandalay Gem. One of the most powerful minerals in the universe! 
History
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The Mandalay Gem is a powerful and coveted item created by the Celestials.[1] Seeking a method to kill Thanos, Peter Quill went to the Savage Orphanage where it was hidden by the Spartax army. However, he was intercepted by Badoon bounty hunters, who were also after the Gem and as well as him. Quill was captured but he managed to escape with the Gem.[2]
Quill ambushed Thanos on the Moon and nearly ended the Mad Titan in battle using the Gem's power, until Thanos warned Quill that his death would destroy the Moon and then Earth. After the fight, Quill discarded the Gem on the Moon. He accidentally activated it to send a signal to the Celestial Graveyard, causing its statues to point to the direction of the Black Vortex.[1]
Properties[]
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Thanos' hand burning at the touch of the crystal
Being of Celestial origins, the gem itself sports incredible properties. Among them is an energy coating that protects the user from the rigors of space travel along with torrential cosmic energies. It also serves as a focus for said energies that the user can manipulate from their person at will, producing cosmic blasts that can stagger even the most powerful Eternal, augmenting their physical proportions, protection from destructive forces and a limited guard against physical abrasion.[1]
In addition to being a weapon, it is also a key to finding the location of the Black Vortex, another Celestial artifact of immense power.[1]