[CaptainCrunch]

Spoiler!

Also here's just a nitpick; if Loki had access to the mind stone the entire first film through his scepter, what's so special about the Tesseract, which is basically just another stone like it? It kind of undercuts the whole thing; "I am attempting to obtain this artifact of ultimate power, but PS, I already have one". Apparently, you give one of these suckers to Ronan and he can destroy advanced civilizations with it but if you give it to Loki (ACTUALLY A GOD) he surrenders to Iron Man in Germany. Just weird.

Spoiler!

You are still beatable if you're only carrying one infinity stone for example, they are very specific to what they do.

Space [Tesseract] - The ability to move anywhere in the universe instantly, it creates portals. While some have found a way to siphon energy from it to create weapons, that's not its pure purpose. Location Asgard

Mind (scepter) - The ability to bend wills to the users desire, you can also use it to move your consciousness to a higher level of existence. You can siphon energy from it to charge weapons but that's not its primary purpose. Location Shield

Aether - is a symbiotic stone, when absorbed by its user gives him or her strength, power and almost unlimited abilities location unknown. Not sure, the collector had it in its museum which was destroyed by the Orb or power stone

Orb - Considered to be the most powerful of the infinity stones. Its simply destruction, it can destroy planets. Novacorp vault

If we go by the Marvel universe concept of the stones being Mind (scepter) Orb (power) Soul (Ether) Space (tesseract)

We are still waiting for the reveal of Time (ability to move through time) and Reality (Ability to control reality and events)

We know that Thanos is pursuing all of them and also pursuing the Infinity Gauntlet, which when combined with the Gems give the user complete control over the multi-universe I think. Thanos wants it so he can court Death.

The colector had the gauntlet and was on a quest to collect the stones, whether to use it or just to have it I don't know.

Loki's aim wasn't to possess the infinity gems, he just wanted to carve out a kingdom by gifting the Tesseract to Thanos who would then have two stones, giving him the ability to go anywhere, anytime and control minds. He was also after the power stone which would give him un matched destructive power which might have given him the ability to go after the Aether.

Even Ronan's goal wasn't the possession of all of the stones, he just wanted the power stone first to gain favor from Thanos but then he got corrupted and just wanted revenge.

I would expect that we are going to see anther stone in Antman and possibly another in the next Guardians movie.

Then the infinity wars might feature Thanos trying to gather the stones and the gauntlet.