ID Help - Looks Like Lava, Magnetic

[Mepostpunk]

Hi guys - I made my first post on the wrong forum, so I'm going to try again. I was poking around in a rock pile with a magnetic tool grabber and found this. It looks like lava with black spots. Can lava be magnetic? Is that what this is? Thanks in advance!

 

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[wherenext1961]

It could be magnetite in the base rock. Magnetite is black, and is an iron oxide. Not sure where you found it. That might give you a clue.

 

[DDancer]

Pumice stone with a high iron content is most likely. If you have any neighbors with lava stone for their yard work run your magnet there You may pick up a few that way too.