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(Raises eyebrow)
He stole a page from the Shepherd's Journal that had a clear detailed picture of the crystal on it. That journal was originally retrieved by a team he led. He knew about and was after the crystal.
Also, when it's pointed out by Helga "there were not supposed to be people here. This changes everything," Rourke says it changes nothing. In a tired, dismissive way, yet. He didn't care about discovering Atlantis, one way or the other.
Coming back to where you started is not the same as never leaving. -Terry PratchettI know he tore off that page and knew about the crystal, but since he didn't know the atlantean language, he couldn't have known that the crystal was a living entity. Their god, in Milo's words. That's what I mean with didn't know exactly.
Edited by Hawaii_Knut Srg. Dornan: Troper, what are you doing here?! Get back to your post!!!It would definitely be Evil All Along; if he was after the crystal from the get go (which Doctor Sweet confirmed), and he said "it changes nothing" when Helga commented that the presence of people being there "changes everything," then yes, he was planning to steal the crystal, consequences be damned.
Doctor Sweet mentioned after the Crystal is taken that Rourke had been after the crystal since Iceland, when the journal was found. He ripped the page out, assuming the crystal to be "big, it's shiny, and it'll make [them] all rich!"

Rourke in Atlantis The Lost Empire is labeled as Evil All Along in the Character Entry, saying:
Yeah, but he didn't know what the crystal was exactly and that the atlanteans are still alive and depends on the crystal to live. Not that he cared when that was revealed. To me, they met a fork on the road. One way lead to not taking the crystal but still gain fame and wealth for discovering Atlantis and the other road, the one he took, would lead to even more wealth while condeming the atlanteans. To me, he sound more like a case of Face–Heel Turn. After all, he came across as reasonable beforehand.
But what do you think? Leave it as Evil All Along or change it to Face–Heel Turn?