If it matches the piece Sidert brought back, it is an approximately equal mix of iron and silica. It would also be many times larger than the largest intact pie

If it matches the piece Sidert brought back, it is an approximately equal mix of iron and silica. It would also be many times larger than the largest intact pieces of meteorites found so far (and the largest are all iron), though this is presumably not enough to rule it out being a meteorite.