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Post by vegasjames on Nov 4, 2013 18:29:31 GMT -5
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panamark
fully equipped rock polisher
Member since September 2012
Posts: 1,343
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Post by panamark on Nov 4, 2013 19:24:49 GMT -5
Interesting James. Thanks for posting. It seems very generalized though, or maybe applies to a specific park, e.g. Petrified Forest. For example I am pretty sure that the Gary Green petrified bog/wood of SE Oregon is green because of chromium. Green petwood is relatively rare. I think some copper can also cause some petwood to be green. But this is very rare. I had never heard that green came from iron, but I am still a novice. <I did some research and found, yes iron when in quite low concentrations and with the right reaction accounts for a lot of greens>
Thanks, Mark
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,715
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Post by Fossilman on Nov 4, 2013 19:47:23 GMT -5
Hum,I'll be trying a magnet on my green petwood.....LOL
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bsky4463
fully equipped rock polisher
Member since September 2013
Posts: 1,696
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Post by bsky4463 on Nov 4, 2013 22:21:20 GMT -5
Interesting, thanks for posting
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horsinaround
spending too much on rocks
If you don't lick rocks...you ain't cool
Member since November 2006
Posts: 315
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Post by horsinaround on Nov 23, 2013 8:19:43 GMT -5
hey everyone, my wife and I were exploring an area in northwestern Arizona, and we found an area that has a dark almost "john deere green" color seeping into the lava and what looks like ancient trees but no pet wood found just some white chalcedony. In one of the knot hole casting was this gorgeous dark green colored jasper. The piece I found is about 4" x 4" x 1/2" thick. I cannot find any particular picture of this material in any of my books. Like I said this is a very dark color of green. not like chrysocolla or even turquoise colored matrixes we find out here in Arizona. if anyone can help with an I.D. it kind of looks like a green moss agate with the light tan coloring in it. thanks Steve
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panamark
fully equipped rock polisher
Member since September 2012
Posts: 1,343
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Post by panamark on Nov 23, 2013 10:27:05 GMT -5
Hi Steve. We really need a picture to help ID. Sounds very interesting.
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Mark K
Cave Dweller
Member since April 2012
Posts: 2,795
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Post by Mark K on Nov 24, 2013 20:57:14 GMT -5
I found some really neat green stuff in the Wickenburg area. I don't know what it is, but I call it jade even though I know better. Might be the same stuff. The thing is, it never looks as good in the MN sun as it does in AZ.
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Post by 1dave on Nov 25, 2013 9:14:46 GMT -5
Interesting they claim "goethite" as the culprit for the yellow instead of limonite. My understanding is that in wet conditions limonite is deposited. On drying out, it alters to goethite which is black. Pyrite can also alter to limonite, then goethite.
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jollyrockhound
spending too much on rocks
Member since March 2013
Posts: 409
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Post by jollyrockhound on Nov 25, 2013 11:43:59 GMT -5
nice article thx for sharing
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horsinaround
spending too much on rocks
If you don't lick rocks...you ain't cool
Member since November 2006
Posts: 315
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Post by horsinaround on Nov 26, 2013 9:28:57 GMT -5
I held the green rock up to the computer monitor. Did you guys see it? ha ha let me figure out how to work photo bucket again..then I'll get the pic up here. thanks Steve I did cut it on my rock saw yesterday and it was very easy to cut...so I know it was soft....I just hope I can get 1 nice cab out of the green.
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