What is this Unfamiliar Metal of source for?

[i.b.it.]

I'm at x:369 y:596 in Blackpit mines. Across from the Shrieker. Bluish gem like thingy in a minecart. Narrator says the object is "carved from unfamiliar metal in an ancient style". what the heck is this?? No idea what it does or what to do with it. Not mentioned at all in any of the detailed walkthroughs I've seen. Can't find anything in search engines either.

[Levianne]

Fane comments on that, when you examine it with him, but I don't really remember, what he said about it. But there's no other interaction. Might be just an object of no specific importance to the story overall.

I'm still in the Reaper's Coast region and have Fane in my party, so I ported there, jumped across the hole and examined it with Fane first, then with Scarlett (my main) and there's just a little difference. It's clearly of Eternal origin, so it's more familiar to Fane, but since Scarlett is also a scholar, her examination wasn't much different. Both sensed Source flowing within, Fane called it a beacon of sorts, but that's all.