anyone help me ID this rock? batryoidal something?

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!

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Reply Wed 7 Oct, 2015 06:30 am
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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Reply Wed 7 Oct, 2015 10:49 am
Art, clearly it's a botryoidal silica, a form or chalcedony
...the black spots amorphous iron oxide


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