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enter image description here We found this rock in field, it is blue/dark blue and around it has 1 cm wide zone where it is like melted, it is 20 cm long, 1 7cm high and 15 cm long, it is almost a square shape, it was found in Latvia so it can't be volcanic rock.

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    $\begingroup$ Please follow this guide when asking for rock identification: meta.earthscience.stackexchange.com/a/125/56 $\endgroup$ – arkaia May 25 '17 at 21:26
  • $\begingroup$ Where was it found? $\endgroup$ – haresfur May 26 '17 at 4:48
  • $\begingroup$ Ir was found in Latvia $\endgroup$ – Reinis May 26 '17 at 7:36
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Scale and hardness will make it easier and more detailed, but it looks like scoria, with a rather nice crusting effect.

You might also consider industrial sources, some smelting slag can look like scoria because it is produced in the same way molten minerals mixed with gas.

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  • $\begingroup$ It was found in latvia outside of it is hard and midle is soft $\endgroup$ – Reinis May 26 '17 at 6:47
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    $\begingroup$ @Reinis, could you modify the question to incorporate the information you provide as comments? Thanks $\endgroup$ – arkaia May 26 '17 at 14:13
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    $\begingroup$ @Reinis you mean latvia has no active volcanoes, the whole baltic sea is volcanic in origin. It might even be ejecta from the Dobele impact crater. $\endgroup$ – John May 26 '17 at 23:02
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    $\begingroup$ @ reinis I mean things like geological formation, composition, and signs of transport. $\endgroup$ – John May 27 '17 at 14:17
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    $\begingroup$ not helpful. Please read this earthscience.meta.stackexchange.com/questions/124/… sections 3 and 4 specifically. And as I said it is a different question. $\endgroup$ – John May 28 '17 at 6:24

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