What is this (rock)?

kimikiri

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Central, PA
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Whites Spectra V3i, Garrett ACE 350, Pioneer 505
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All Treasure Hunting

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Limonite concretion? Welding slag? Maybe not too likely a meteorite. You said you detected it...or did you stumble on it? Does it register on a detector and is it magnetic or hold a magnet?
 

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(impurities) slag or clinker from burning coal. if you ever clean out a coal stove or shovel cinders you'll see lots of them.
 

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Thanks for the replies. I thought it might be some sort of slag, but the shape threw me off.
 

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sure looks like slag
hard to tell due to the color in the photo
My money is on slag
Brady
 

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