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This rock is heavy and a magnet sticks to it. I don't know where it's from but I got it from somebody who bought a rock collection from an auction of a collector in MN. I grinded a spot on it and it looks like there's specs of gray or silver metal.

It looks like it has a fusion like crust and slight flow lines.

It also smells burnt like sulfur.

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    $\begingroup$ Where did you find it? If in iron-smelting country then probably slag. If somewhere far from iron smelting then further investigation is needed. A photo of a polished section would be useful. $\endgroup$ – Gordon Stanger Jan 5 '17 at 6:11
  • $\begingroup$ I believe its a Foundry trough plug slag. I just did some more researching and it sounds like thats it. $\endgroup$ – Splitrock Jan 5 '17 at 6:36
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    $\begingroup$ Please look at meteorites.wustl.edu/check-list.htm and the FAQ linked from it meteorites.wustl.edu/realities.htm . $\endgroup$ – b_jonas Jan 5 '17 at 10:39
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It's slag. Usually when you find something that you think is a meteorite, it's usually a slag.

My biggest hint is the presence of what seems to be air bubbles visible in the first picture. You don't get those in meteorites.

Also, the brown rim? It's weathering (aka rust), not a fusion crust.

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  • $\begingroup$ Sure, it has a lot of "slag" hallmarks. The rounded edges, however, indicate a significant amount of erosion (and age), making it look more like 90% of basaltic rocks that have flowed all over the American Southwest. $\endgroup$ – Knob Scratcher Feb 6 '17 at 15:40

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