Magnetite sand. 
Another element (compound actually) from Chris.  He panned this sand from a Lake Michigan beach, like panning for gold except you get black magnetic granules instead of rich.  It is very magnetic, as you can see from this picture (there's a magnet under the paper, which is making the sand stick up). 
Source: Chris Carlson 
Contributor: Chris Carlson 
Acquired: 15 August, 2002 
Price: Donated 
Size: 1" 
Purity: <40%
 |  
  |  
 |  
  |