Columbus Genius, Max, and Zona were all tubesets made with Nivacrom alloy. Does the tubing sticker on your Bianchi have any of these names (or other tubing name)?

Andy's absolutely right about frame weight. Depending on which Nivacrom tubes are used (diameters, wall thickness, butting profile) a 56cm frame should weigh 3 to 4 pounds. The steel fork should be between 1.5 and 1.8 pounds.