User blog comment:Blinded-Men/Possible Future DLC/@comment-3496379-20120709150957/@comment-3496379-20120709185750

@Sergeant

Katria said that was a possibility.

But if you look at her journal, she makes a note about how Raldbthar was the primary source of Aetherium, and she ponders if it might have been extracted from some deeper mine.

And you can't delve much deeper than Blackreach. Next time you go down there, take note of all the bluish-green glowing rocks around you. I would not be surprised at all if that right there was raw Aetherium.