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Chunk of concrete?
 
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Looks like a plaster or cement piece. Part of an old building cornice or monument . . . perhaps?
 
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Stale cheese that a rat chewed on. Looks crystallized where what ever it is broke off.
 
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my guess is gypsum specimen.naturally occuring shape.... download.webp
 
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It is metal that sometimes crystallizes when poured at certain temperatures.
 
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prolly should have mentioned that in begining...molten brass water cooled quickly.
 
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