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Need HELP identifying this rock

Forums: Geology, Rock, Rocks, Geology Uknown Rock Identify, Uknown Rock
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oache
 
Reply Mon 23 Nov, 2015 09:41 am
My brother found this rock in the chalk (in the ground)
Any idea what it could be?

More photos here: https://www.dropbox.com/sh/9lnq5m7nhbb7pzt/AAA94PQ9sv_iElzvUV31EGNqa?dl=0
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Type: Question • Score: 3 • Views: 1,252 • Replies: 3

 
farmerman
 
  3  
Reply Mon 23 Nov, 2015 10:46 am
@oache,
its called MARCASITE. Its a kind of fools gold that forms as an alteration from several pyrite minerqls. Its always found in sedimentary deposits and chalk is a favorite locale.
Nice!
rosborne979
 
  1  
Reply Mon 23 Nov, 2015 11:48 am
@farmerman,
Cool. I was gonna guess Pyrite when I first saw it, but it didn't have cubic crystals so I wasn't sure.
farmerman
 
  2  
Reply Mon 23 Nov, 2015 12:23 pm
@rosborne979,
They call it "cockscomb ore" in the mines and it usually means the iron layers will soon peter out
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