🔎 UNIDENTIFIED What the heck is this rock?

[rockpassion]

Found a strange rock today in the river and it weighs 3750 grams and does not atract a magnet and hase huge crystals which look like Wavelite. Would love to know what it is.

 

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[DizzyDigger]

Those odd markings in the third pic make me think they're some kind of fossils, but I know little about rocks.

 

[rockpassion]

Those odd markings in the third pic make me think they're some kind of fossils, but I know little about rocks.

Those are crystals and this is what the inside looks like, slag maybe? how old and what kind?

 

[rockpassion]

wel it is slag afterall, lots of it on etsy. this one is solved