If a rock is “really hard,” then it is not a meteorite
Some terrestrial rocks are hard because they contain quartz. Meteorites do not contain quartz. Small stony meteorites can be easily smashed with a hammer. (I have smashed a lot of lunar meteorites with a small hammer.) Quartz-rich terrestrial rocks are hard to saw, but it is not difficult to saw a stony meteorite with a rock saw.
Unless it is badly rusted, iron meteorites are hard. If it is metal and you can bend or break it, then it is probably not a meteorite