I'm aware that the densest stable element is osmium at 22.61 g/cm^3.
And that there are unstable elements such as hassium and meitnerium which are predicted to have densities of 41 g/cm³ and 37.4 g/cm³ respectively, but those have half lives of only a few seconds.
I'm also aware that things like quark-gluon plasma has been made in the LHC that is also much denser.
But I'm also aware that the main reason for osmium's high density is not its number of nucleons, as there are a few stable elements that have more nucleons but are less dense such as lead and gold, so much as it's chemical structure leading it's nuclei being closer together.
Is there some alloy or compound that has a higher density than osmium that has been produced in macroscopic quantities, and after having been produced remains denser than osmium at 1 atm of external pressure?
Edit: I've already seen Is there a compound denser than the densest element. But while that might have been the title of that poster's question, it wasn't the crux of what they were after. They really wanted to know what they could buy that was denser than mercury for use as a prop. And the only answers only address that part and not the crux of my question. Furthermore, I am aware that such materials DO exist, I'm specifically asking which ones have been produced here on earth in macroscopic quantities at 1 atm.