There's a good chance it's carbon. This was (and is to a certain extant) a common fork construction technique. It's easier and probably cheaper to use metal to safely handle the clamping forces of quick releases and stems. Columbus and others still make forks like this: https://ciclicorsa.com/shop/columbus...on-fiber-fork/

That said, there was a lot of aluminum being wrapped in carbon in the 90s. Any stamping on the steerer tube? What bike is this on? It might be a stock fork and some internet sleuthing could tell you whether it's real carbon or not.