system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Can there ever be more Infinity Stones?

I remember reading in a book somewhere - I completely forget which book though :( - the thought that if there can be one of something, why can't there be more than one of it. That was relating to Gods, and the fact that a lot of religions insist that there is exactly one God, but what's stopping there being more than one.

Following that through, what's stopping there from being more than 6 Infinity Stones? Or, indeed, multiples of any "unique" artifact.
gpt
Iirc in the Ultimate universe there are more than 6 infinity stones, and they originate from entirely different circumstances. 

For example: Tony Stark has an infinity stone growing inside his head, causing hallucinations that are capable of interfacing with technology (reminds me a bit of the sentient cosmic cube in the more recent hydra cap stories).