I agree it looks like silicon metal, but since that doesn't occur naturally, I wonder what a chunk of the stuff would be doing out where someone might find it beeping? Probably something else entirely.
In any case, we're just looking at a photo, and up close with the naked eyeball it might look quite different, the sheen can throw photo appearance off due to lighting.
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In other threads there's a black rock that sticks to a magnet. Probably magnetite.
The mostly white rock with what appears to be a veneer of sulfide ore that's also attracted to a magnet, I'm guessing that it's quartz with magnetite inclusions.
A geologist or savvy rockhounder should be able to identify all of these, except that sometimes it's hard to tell a lump of magnetite from a meteorite. As someone else pointed out, a lump of slag with fused surface may also mimic a meteorite and require a meteorite expert to positively identify. ......Generally speaking, any place there's slag, there's lots of it, so if you're finding known slag, anything that looks like a meteorite is actually gonna be slag.
--Dave J.