what could be this one?

[david guerreiro]

Can someone help me on this one?

 

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[JohnnyFlake]

Very doubtful - there are obvious fracture lines within the stone!

 

[david guerreiro]

Very doubtful - there are obvious fracture lines within the stone!

Its true, is from the weather, but this one is very attracted by magnet, in fact I have a few and they are all attracted, I will send some pictures of different type.
Thank you