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Umm, I thought there was the concept of antimatter. No?
In the sense philosophers mean it, that's still material. A visible chunk wouldn't even look or act different until you graze a few atoms and explode.
I don't really understand what OP is going for here to be honest.
There's plenty of things you can't see but only see the effects of in the universe. Whatever the qualifying thing is I guess needs to sit outside of the universe entirely to qualify, but like some branches of physics and math are talking about things such as higher dimensions and the potential that the universe is a simulation of some sort. But I'm sure that doesn't count either. I guess it has to not be observable nor reasoned around or something. 🤷
Sure, Materialism is slippery to define. OP gave the counterexamples of Dualism and Idealism, though, so you can just go off of those. Most people still believe in Dualism, even.
That doesn't literally mean it's not matter