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Post by gingerkid on Mar 14, 2014 6:56:20 GMT -5
This is an agate after barite pseudomorph from McDermitt, Nevada. The chalcedony looks like plume agate that you can see in the base of the specimen, well, kinda after looking at my photo. Thanks for lookin'! Agate after barite pseudomorph McDermitt, Nevada, USA close-up shot
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rockroller
spending too much on rocks
Be excellent to each other.
Member since October 2013
Posts: 359
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Post by rockroller on Mar 14, 2014 10:37:25 GMT -5
Nice specimen! Don't believe I have seen anything quite like that.
~Roland
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Post by jakesrocks on Mar 14, 2014 10:53:56 GMT -5
Great specimen. Pseudomorphs are some of my favorite collectables.
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Post by iant on Mar 14, 2014 13:01:01 GMT -5
Lovely rock! As Roland, I've not seen anything like that before!
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,182
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Post by jamesp on Mar 14, 2014 14:14:42 GMT -5
Wow. Those crystals grew up in a wind storm. That's a beauty Jan.
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Post by Pat on Mar 14, 2014 16:09:25 GMT -5
A lot going on it that intriguing specimen. Every area in your rock calls my eyes to linger.
A friend says that McDermitt has everything. I think so!
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gemfeller
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Member since June 2011
Posts: 3,815
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Post by gemfeller on Mar 14, 2014 16:09:36 GMT -5
Really nice piece, Jan. Natural processes can be amazing.
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bsky4463
fully equipped rock polisher
Member since September 2013
Posts: 1,696
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Post by bsky4463 on Mar 16, 2014 12:22:42 GMT -5
Looks like it is in motion... Very unique, way cool. Cheers
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,341
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Post by quartz on Mar 16, 2014 21:53:15 GMT -5
We've been there several times, never ran across anything like that one, lucky you. Nice piece.
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Post by gingerkid on Mar 17, 2014 14:22:00 GMT -5
Thank you for your kind comments!! quartz, I'll see if I can find out where the specimen was found in the area. Pat, I really like your new avatar!
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,341
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Post by quartz on Mar 17, 2014 21:50:09 GMT -5
Thanks, we would like to find some of that.
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Post by pghram on Mar 18, 2014 15:22:34 GMT -5
Nice specimen!
Rich
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Post by gingerkid on Mar 19, 2014 8:07:04 GMT -5
Thanks, Rich! quartz, I asked @rocks2dust about the locality of the specimen. As soon as I hear from him, I'll give you a holler.
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Post by gingerkid on Mar 20, 2014 9:55:39 GMT -5
Hi, quartz, the specimen likely formed in one of the volcanic formation areas in the McDermitt area (quoting @rocks2dust, "once the location of the hotspot that is now under the Yellowstone super-volcano").
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gemfeller
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Member since June 2011
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Post by gemfeller on Mar 20, 2014 10:46:37 GMT -5
Hi, quartz, the specimen likely formed in one of the volcanic formation areas in the McDermitt area (quoting @rocks2dust, "once the location of the hotspot that is now under the Yellowstone super-volcano"). Yes, it was. But it's not the hot spot that moves; it's the North American tectonic plate. As can be seen from the image, the plate has moved over the hot spot generally to the southwest. The "trip" has taken millions of years. The hot spot has left a huge volcanic scar across southern Idaho, with previous caldera locations shown as circles. I grew up in the area around 8 and 10 on the map and have had a lifelong intense interest in the area's geology. With that much hydrothermal activity over such a long period it's not hard to see why McDermitt, the Owyhees, south-central Idaho and Montana produce so much material of lapidary interest.
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Post by johnjsgems on Mar 20, 2014 11:49:28 GMT -5
I have buckets of agatized barite from Utah too. Neat stuff when sliced. Most of it is in reds but there are some blues also. The exterior blades are less pronounced than your specimens. Some of the Utah stuff resembles bone a little and I've heard of dealers selling it as dino bone. Or trying to. Hopefully out of ignorance.
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jollyrockhound
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Post by jollyrockhound on Mar 20, 2014 13:11:55 GMT -5
Very unique Love Mcdermitt!
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jollyrockhound
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Posts: 409
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Post by jollyrockhound on Mar 20, 2014 13:12:08 GMT -5
Very unique Love Mcdermitt!
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Post by gingerkid on Mar 20, 2014 14:46:23 GMT -5
Thank you, gemfeller, for sharing information on the McDermitt area. Very cool! I figured I would goof on trying to give the locality of the specimens. Thanks for your expertise. johnjsgems, do you have any pics of the material in blue? Thank you, jollyrockhound!
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