Why is black sand magnetic?

Splunji

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I noticed that my magnetic glass cleaners pick up some of the black sand in one of my tanks where I have black sand. I learned that apparently black sand (at least for aquariums) is magnetic. I'm assuming this is safe for fish, otherwise they wouldn't have labeled it "fish safe"? Anyhow, I'm curious as to why black sand is magnetic.
 

Madchild57

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Splunji said:
I noticed that my magnetic glass cleaners pick up some of the black sand in one of my tanks where I have black sand. I learned that apparently black sand (at least for aquariums) is magnetic. I'm assuming this is safe for fish, otherwise they wouldn't have labeled it "fish safe"? Anyhow, I'm curious as to why black sand is magnetic.
It probably contains iron, if I had to guess off the top
 
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Splunji

Splunji

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Jerome O'Neil said:
Black sands are frequently made up of iron oxides. They are ferrous, so they are magnetic.
Madchild57 said:
It probably contains iron, if I had to guess off the top
Ah, that makes sense. Thank you.
 
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Splunji

Splunji

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Nickguy5467 said:
hope you didnt just scratch up your glass with that thing
Just barely. I noticed sand got behind it when I had it sitting in the bottom of the tank, and when I moved it a little, it scratched. Now, I keep it at the top of the tank and make sure there's no sand by wiping my thumb over it.
 

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