Working at a construction site about a mile east of Mukwonago, spotted some blue color in the bulldozed ground, and pulled out this 4.8 kg. mass of massive hematite. Or hematite ore, since there is some rock in this sample. SG about 5, hardness 5-6. In soaking it in iron-out to clean it, it soon turned the water blue, so I aborted that effort. ...