What are the infinity stones? If you've been following the Marvel Cinimatic Universe, you've seen them, you may just not know it! From the comics to the movies, there's been a bit of a translation issue because of the history of the stones within the comics themselves. As you can see from the two comic pages below (thanks to screenrant.com for the great copy of these historic pages!), there are differences in the stone colors within the comics themselves.
Tesseract: Space Gem. The Tesseract heps Asgardians travel and helps aid an alien invasion!
Mind Infinity stone. We've seen this stone often as part of Loki's staff, and we've seen attempts to use it's power for nefarious acts throughout the Marvel Cinematic Universe.