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anyone help me ID this rock? batryoidal something?

Forums: Science, Geology, Identification, Black, Rocks
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arthrockopod
 
Reply Wed 7 Oct, 2015 06:16 am
I found this rock on the Shoshone National Forest out in Wyoming. Something batryoidal I guess, but no idea beyond that. Thought the black stone might be hematite, but it's not magnetic. Thanks!

http://cs.newpaltz.edu/~forcel96/images/IMGP3595.jpg
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Type: Question • Score: 4 • Views: 1,435 • Replies: 4
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rosborne979
 
  1  
Reply Wed 7 Oct, 2015 06:30 am
@arthrockopod,
Very cool looking rock. Looks like a mixture of minerals. Farmerman is our site geologist. I'm sure he will be able to help.
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dalehileman
 
  1  
Reply Wed 7 Oct, 2015 10:49 am
@arthrockopod,
Art, clearly it's a botryoidal silica, a form or chalcedony
...the black spots amorphous iron oxide

https://books.google.com/books?id=TqA_4U2mYPMC&pg=PA60&lpg=PA60&dq=botryoidal+silica&source=bl&ots=o3SJVLamsr&sig=2bOZKAG5-uX9Y3wYGO5jsC3Nvbg&hl=en&sa=X&ved=0CCkQ6AEwAWoVChMI-47ptuewyAIVFSyICh1Whgok#v=onepage&q=botryoidal%20silica&f=false

Per Ros above, doubtless Man will elaborate
farmerman
 
  2  
Reply Mon 12 Oct, 2015 12:55 pm
@dalehileman,
yep. I agree with dale. The white stuff is called drusy quartz .
Are you taking "Rocks for Jocks" at SUNY New Paltz???
dalehileman
 
  1  
Reply Mon 12 Oct, 2015 01:12 pm
@farmerman,
Yea, Man, thanks, sure enough "drusy" was the term that escaped me
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