OK children, quit arguing. Debating is cool, but just flat out arguing is annoying.
1. If an Atium misting could also burn Malatium that would break rules already set up by the magic system and if you ever read Brandon's First Law Essay he talks about different magic systems and how they need to be set up. One of the sections talks of how systems with set rules that are strictly followed should not break those rules, so Brandon wouldn't do that.
2. The term Atium Misting and Seer ARE confirmed in the book.
3. The book inherently DOES CONFIRM that none of these "Atium Borns" exist by simple laws of the Magic system.
4. I guess if you would like to involve Hemalurgy into the argument you could make an "Atium Born" but then it wouldn't be the same thing that you are talking about.
First, wasn't arguing, never do.
1. As comatose said.
2. They are confirmed by people in the book, not by actions in the book. No "Atium Misting" ever tried burning Malatium and failed.
3. The book doesn't even tell all the laws of the magic system, why would you assume you know them.
4. Not involving Hemalurgy, not required.
Mok, I like where you are going with that. Yeah, I suspect Rashek made the pits very much for that reason but it makes me wonder why he didn't make it more like a typical mining operation. I know he wanted to keep things secret but at the same time, it seems a very bad method of extracting the atium. Maybe there were other things we don't know that were involved with the pits. Maybe the pits already existed(like the nuggets of Lerasium) but Rashek just learned about them when he took the well. Interesting.
I would guess there are exactly the same number of divine elements as there are shards. They said that the divine elements are representation of the shards within the world.
I wonder if Elend injesting the last piece of Lerasium ended Preservations life in a way. With no body left and his mind caught up in holding Ruin hostage and finally his power being dispersed, Preservation could no longer survive. Might be why Rashek left just a single piece as he knew.