From your sheet of composition, it is mostly SiO2. Silicon dioxide 36 %. Some Vanadium, 20%. And then by percentage ferrous oxide, 14%, and finally 10 percent aluminum. The rest are trace metals. It looks like a piece of industrial slag. It is magnetic from at the very least its ferrous content. The silicon dioxide is one third of your composition. Not magnetic.
Vanadium is used in the production of steel especially drill bits and engine parts, where the steel is going to be subject to high heat.