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How do you test black sand? With a magnet?

Deese

New member
I was detecting in a park and my detector was acting funny. All the holes I dug have black sand in the first 8-12 inches then clean light colored sand below. This park has alot of trees in it,could the black just be from the decomposing vegetation discoloring the sand? Or could it be black sand? How would I tell?
 
Yes, a magnet will attract black sand if it's black from iron minerals. At least this has been my experience when detecting in upstate NY. Here in Florida we have some black sand but it's ground up fossil material and is not magnetic at all.
 
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