3
   

Need HELP identifying this rock

Forums: Geology, Rock, Rocks, Geology Uknown Rock Identify, Uknown Rock
Email this Topic • Print this Page
 
 
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
  • Topic Stats
  • Top Replies
  • Link to this Topic
Type: Question • Score: 3 • Views: 1,303 • 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
0 Replies
 
 

Related Topics

What is this..? - Discussion by jaygree
what are these marks on the rock? - Question by MaAxx8
good videos to learn geology - Discussion by danman68
MT Antero Colorado - Question by The Corpsman
Yttrium and Niobium in Granite - Question by EvilPenguinTrainer
Birth of an Ocean - Discussion by GoshisDead
Biotite vs Brown Hornblende - a noob question - Question by AllGoodNamesAreTaken
What's The Point To Geology? - Question by mark noble
Help Identifying Rocks - Discussion by mthick
Can anyone suggest the origin of these rocks? - Question by Mikiemax
identify kind of rocks - Question by georgevan1
 
  1. Forums
  2. » Need HELP identifying this rock
Copyright © 2024 MadLab, LLC :: Terms of Service :: Privacy Policy :: Page generated in 0.06 seconds on 12/22/2024 at 06:08:21
▲ ▼