Nearly round metallic rock found in Arkansas, inside is marbled with shining metallic. After cleaning with dawn, water and soft tootbrush I matched 2 parts together and turned my back, heard a loud boom, and found part of the smaller piece several ft away. No smoke or damage to bigger piece. The smaller piece was split in three places. My friend thinks it's a meteorite. It isn't magnetic. I'm eager to learn what it is. Thanks

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    $\begingroup$ It is a bit unusual for a rock to explode when in contact of water after sustaining for long exposed to the elements. But to narrow the query you may add typical sample information like: What hardness? Trying to write on a chip of white unglazed porcelain, what colour is the streak you see (if at all)? Sample's origin is from a river bed laying in water, or from a hill exposed to air (and weather), a mine or a defunct factory? $\endgroup$ – Buttonwood Feb 22 at 17:04
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    $\begingroup$ Wild guess : Looks like it contains specks of copper - possible copper slag , a glassy black material . As a glass ,it may have residual stresses trapped in it . Somehow your manipulation caused the residual stress to fracture the glass . Such slag may be produced at a smelter of a foundry. $\endgroup$ – blacksmith37 Feb 22 at 21:30
  • $\begingroup$ Rock identification requests are off topic on this site now, as they grew to be a constant stream of questions which really weren't of use to anyone but the person asking them. Not an expert at all myself, but not having magnetism it sounds less likely to be a meteorite (nor does it seem to have flowlines or a crust, or match the pictures or other features shown on this site much). But hope you'll be careful with it whatever it is if it's so volatile that it does that! :-o $\endgroup$ – JeopardyTempest Feb 22 at 21:44
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    $\begingroup$ your pictures are sharp and nice but if you take the pictures outside on a cloudy day or out of direct sunshine(and no flash)the quality will be a lot better making it easier to identify the rocks.even if this question is off topic here it might help others identify your rocks. $\endgroup$ – trond hansen Feb 23 at 6:49
  • $\begingroup$ please take a picture of the surface of where the rock broke,how a rock breaks can tell a lot about the crystaline structure and is useful when identifying the rock. $\endgroup$ – trond hansen Feb 23 at 6:58

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