magnetic rocks what kind though?

[nappy26]

A magnet wIll stick to all these rocks any clue what kind any of them could be?found in Se Minnesota

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[MrLee]

Magnetite, iron ore in them.

 

[nappy26]

 

[Hannah Jo]

This looks cool! I have heard they can be detected using magnetometers!

 

[Jhaddad8]

Mn is known for huge fe mines, that's probably what you found. I suspect those rocks are not worth anything special.