arent they usually very high in iron content? hit it with a metal detector

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wikipedia has a detailed page on chondrites. Looks like 80 some percent of them have at least some or a lot of iron. Take it to a nearby university geology dept. and they should be able to ID it. Looks to me like an unusually water worn basaltic cobble.

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I believe it is a piece of boiler slag. Such material is often used in gravel driveways or mixed with stone for driveways. I have seen several pieces of "stone" similar to this over the years. Has a worn appearance, like water wear, but isn't.

All the googling I just did didn't find a photo which is similar, most describe and/or show a black granular or glassy stuff. But I still think your piece is man made slag from some combustion process.

Rgds,
Chris W.
'95 E300D, 341K

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