I'd say it's a 100% chance it was the space stone. The whole movie was about how, once completed, Thanos could simply snap his fingers and destroy half the universe's population. Once he got the mind stone, completing the gauntlet, that's exactly what happened. Not to mention he was able to use its power, the ability to teleport throughout the universe, once he acquired the stone.
I think they've given some hints as to the possible ways Thanos could be beat. The whole Gamora soul stone stuff and the Gauntlet breaking after he snaps his fingers makes more sense than Loki giving him a fake stone.
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