[meteorite-list] Magnetite/Glass Meteorite Balls

[Mike Groetz]

   Anybody know or want to guess what the "meteoritic
jurassic balls" (as the lister call them) are in this
auction?

http://cgi.ebay.com/Meteorite-balls-sand-concentrate-microscope-rare-sample_W0QQitemZ200126606038QQihZ010QQcategoryZ3239QQrdZ1QQcmdZViewItem

   I'm not trying to be funny or sarcastic; the photo
with the auction is pretty interesting. Would sand
actually round and polish itself this well in a stream
bed?
   I believe this is not meteorite related- but what
really is this material?

Thank You
Mike


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