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Southern, ID. Green rocks

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Author Topic: Southern, ID. Green rocks  (Read 337 times)
Joe Gussenhoven
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Posts: 11

« on: August 28, 2015, 04:09:42 pm »

Hello. I was poking around and see a lot of these very deep green rocks.  Copper?   
Hope I posted this in the right place. Was near Challis. Found some agate with the same deep green running through it.
Stopped on the way home so only had a couple hours.


* P1090702.JPG (582 KB, 1280x960 - viewed 24 times.)

* idaho agate.JPG (110.3 KB, 493x723 - viewed 17 times.)
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« Reply #1 on: August 29, 2015, 05:29:52 am »

The first one is a piece of basalt like material that we say is "jasper that wasn't quite cooked long enough". Meaning it didn't fully silicify. The second is a nice agate piece.
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- Mark

Trying to see the potential in every rock (and everybody).
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« Reply #2 on: August 29, 2015, 07:35:27 am »

    Nice green something. The hammer is your friend and teacher here. Whack that baby, gently, and see what is under the green skin. And post a picture. Hope it is more than black basalt....
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Joe Gussenhoven
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« Reply #3 on: August 30, 2015, 10:29:21 am »

Thanks guys. Found green mixed with brown basalt. Never seen that shade of green before.


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« Reply #4 on: August 31, 2015, 06:35:58 am »

The green looks like a vitrified tuff which can have all types of silica levels. It is quite common in central Oregon and tempts many people but the silica levels are almost always too low to get a high polish.  It does have a unique color , very saturated . I have seen copper minerals that are somewhat similar but are always just a bit different than the tuff. If you grind the tuff you will be able to see how much open structure it has. If it is dense without too many air holes it can make pretty nice accent beads .
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