Sword Options

There's a swordsman who challenges be to a duel. I didn't have a weapon so I'm in this temple rock garden. I pick up this rock which apparently is suppose to be forged into a sword. My dream skips how the sword was made, but what I get is this extremely flimpsy blade. To describe it, it was like it was thin like paper almost transparent, but could fold like cloth. When I start to wield it, the blade vibrated bluish and settled into a rigid form. This swordsman's sword was cut clean with one strike.

Sounds sorta futuristic to me.
A cloth-like sword made from rock? Sounds like ceramic monofilament blade! It even looks like two major problems of monomolecular wire are solved, namely rigidity and visibility.