Still no respect for Wonder Woman, and that's all there is to it. A low-class, crapbag loss, like Lobo, doesn't get to break Amazonium in any universe, where the iconic power of Wonder Woman is respected.
COMBINING THE BIGBADITUDE OF THANOS WITH CHEETAH'S FEROCITY, IS JANUS WONDER WOMAN'S GREATEST SUPERVILLAIN?...on WONDABUNGA!!! Look alive, Kangaliers!
Actually an alloy is something you get when you take something basic, like iron and then treat it with something to make something else. Like you take iron and treat it with carbon and you get steel.
Supermanium actually does sound like an element rather than an alloy since it sounds like Supes just took a wee star and hammered it into something else.
The "ium" suffix is the only thing about Supermanium that sounds like an element to me.
Real-world alloys can be simple, like carbon steel, or Cromoly(steel with Chrome and Molybdenum), then you have insanely complex stuff like Corten which has around a dozen ingredients some of which aren't metals.
I don't think it should be a debate about whether it is a true earth metal or not...just call it metal. Amazonium Metal! Supermanium Metal! Shazamium Metal!
After all, Hawkman gave us "Nth Metal", but is that really a metal? Not an earth metal for sure!