A rock I found

[Fluid_Thought]

This rock was found this morning while hunting a school yard. The rock was just below the surface but was in rock that was hauled in from a quarry so I'm not sure of it's origins. It loves magnets and makes my detector go ape. As far as weight and size, see my picture of my finds in todays finds for a comparison with other objects I found today. It also seems slightly heavier than it should (this could be my desire to find a meteorite though too). Any ideas?

 

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[stoney56]

It's probably magnetite. There was a bunch of it in Colorado that played havoc with the detector.

http://mineral.galleries.com/minerals/oxides/magnetit/magnetit.htm

 

[Fluid_Thought]

Hi all, I did a streak test on this rock and tend to agree that it's probably magnetite. Thanks.

 

[Ant]

We call that Ironstone around here, and a magnet will stick to it.