Please help identify this rock

[bottlecap]

A friend of mine found this at her farm while digging in a garden next to a barn. Looks like any old rock but there is a kicker....this thing has something in it that makes a magnet stick to it, you can toss a crappy magnet from the fridge at it and the magnet will stick to the rock. Any and all info appreciated. I told her I would do my best to research it for her. Thanks a bunch!

 

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[DDancer]

High iron content makes a lot of rocks stick to magnets and vice versa. The usual mineral is magnetite, the same black sands you pick up with a magnet in soil/sand, that's disbursed thru out the rock matrix. There are other iron minerals that will hold a magnet but magnetite is the usual culprit.

As to the stone in question its what I'd just call a field stone Probable quartz with micro crystalline magnetite all thru it.

 

[bottlecap]

High iron content makes a lot of rocks stick to magnets and vice versa. The usual mineral is magnetite, the same black sands you pick up with a magnet in soil/sand, that's disbursed thru out the rock matrix. There are other iron minerals that will hold a magnet but magnetite is the usual culprit.

As to the stone in question its what I'd just call a field stone Probable quartz with micro crystalline magnetite all thru it.

Thank you! Knew someone would help out! I really appreciate it!