Rocks found on the beach

[Mike2185]

Good Morning Everyone,

Recently I was detecting down at the beach and there was quite a bit of trash that had been washing up that morning. While I was running my detector over the trash I came across a couple of these rocks that kept setting my detector off. I have no idea what type of metal could be in these, and what exactly they are. All I can say is that these rocks are very light in weight.

Thank you all for you help!

 

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[Digs68]

Looks like magnetite or "lodestone".

 

[Digs68]

Will metals attract to it like a magnet?

 

[Digs68]

Also could be pumice, I guess. Does pumice set off a detector? I guess it would have some traces of metal in it..

 

[Mike2185]

Thanks for the reply Digs...No the rock is not magnetic.

 

[taz42o]

Try burning a piece if it burns its probably coke, If it wont burn its probably a coal clinker.
Clinkers will register on a detector because of the minerals,Im not sure if coke will register.

 

[comfortably numb]

Silver turns black in the ocean, see if its some coins.

 

[nomad1]

Most likely a clinker as Taz42o said. Coke is coal that has been baked so it would not register. Pumice is a volcanic rock that is very light,will float on water due to all of the air chambers and is composed silica.

 

[Mike2185]

Thank you everyone for your help. I think I'll just consider it a clinker.