hidden objects

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amizengo:
hello to all.
hidden under ground we found these objects.
It has been a long time 3 years and nobody can define what are these.
thanks.

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billder:
i can't be sure but the first looks like some kind of sulphide marble
the second might be an ore sample or broken refractory
the other two pieces may be firebricks or pieces of crucible or furnace lining

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billder

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