system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] What material is Thanos' Double–Edged Sword from Endgame made of? Is it Uru? If so, how was it able to break Captain America's shield, while Mjolnir, which is also made of Uru, was not?
gpt
I don't think we know officially what it was made of, but the likely answer for the damage was impact vs. cutting force.  Cap's shield was Vibranium and that metal is particularly good at absorbing then redirecting shock force.  Mjolnir is an impact weapon, delivering all of its energy via blunt force (exactly what the shield is made to defend against).

The Sword has a sharp cutting edge and, as we saw from Cap's fight with the Black Panther, the shield can be scratched by a hard enough edge.  Thanos just turned that up to 11.