Thread:Shabook/@comment-421074-20141104155844/@comment-112155-20141104160321

The article says it is an Infinity Gem, something that it has been already confirmed by Marvel.

And it also says "Shortly after Guardians of the Galaxy hit theaters, we theorized that Loki’s weapon could very well be the mind stone, and while we can’t say for sure if it is or not, we now know that it is one of the six sources of power the Mad Titan will posses when he wrecks havoc on Earth’s Mightiest."

So it doesn't confirm it, it clearly says that it is not confirmed.