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Post by 1dave on Jul 16, 2014 16:14:31 GMT -5
I was looking at some of my latest material from Pipe Line Canyon and started noticing the color changes and banding just below cooling surface crusts.Notice the rock above with the word "Surface" written on it in white. Below is a close up so you can see the surface texture and some of the banding and "moss" patterns below it. The followings are all photos of another rock, but look how the various "surface crusts" are placed. The bright white triangular spots you see are reflections from crystal faces. Next you can see three surfaces meeting at the "knob". And the grand finale, a surface impacted into another. It looks to me like this material was violently laid down, started cooling, then was shattered and tumbled, then cooled again, then re-shattered. No wonder it is so mixed up.
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transcendental
spending too much on rocks
Member since June 2014
Posts: 459
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Post by transcendental on Jul 16, 2014 16:43:40 GMT -5
Beautiful specimens
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Post by snowmom on Jul 20, 2014 19:08:45 GMT -5
brecchiated stuff is the coolest. That stuff is sooooo red! quite a different from the rind to the middle... just like that famous box of chocolates... you never know......
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deserthound
spending too much on rocks
Member since December 2013
Posts: 390
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Post by deserthound on Jul 22, 2014 21:47:30 GMT -5
Great pics you really bring out the colors..and they look so life like...do you have a thread where you have shared your picture taking skills..and equipment used..thanks for sharing
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Post by 1dave on Jul 23, 2014 1:43:24 GMT -5
Great pics you really bring out the colors..and they look so life like...do you have a thread where you have shared your picture taking skills..and equipment used..thanks for sharing I use a tiny Kodak Easy Share M341 and usually the sun. Because my hands shake so bad I have to use a tripod. I crop the pictures using Corel PhotoPaint 8 that I have had for many years. I use a piece of MDP painted white on one side, black on the other. The black makes the camera adjust too light, the white too dark, so I have to adjust the balance a tad. That is about it, but I need to take some close-ups of the pyramid crust structures I see here . . . if I can figure out how to get back to that camera feature. Perhaps tomorrow.
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Post by 1dave on Jul 23, 2014 12:52:04 GMT -5
Aha! I finally fingered it (my camera)out! I have to turn the dial to SCN to get to the close up function. Here are two rocks with cooling crusts on them. Close up of the first: Notice quartz crystals are terminating with three sided pyramids. That means they are "low Quartz" that crystallizes between 273 and 573 oC. "High quartz" terminates with six sided pyramids between 573 and 876 oC. The second specimen was part of the toe of the flow, crusts forming on the end, top and bottom. Here are both sides:
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vugs
starting to spend too much on rocks
Rockbiter
Member since February 2014
Posts: 225
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Post by vugs on Jul 24, 2014 19:54:40 GMT -5
I find alot of material with that type of crust here in Southern California, Acton area. Thanks for the explaination.
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Post by 1dave on Jul 24, 2014 22:21:48 GMT -5
I find alot of material with that type of crust here in Southern California, Acton area. Thanks for the explaination. Is your material welded ash flow Tuff?
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vugs
starting to spend too much on rocks
Rockbiter
Member since February 2014
Posts: 225
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Post by vugs on Jul 26, 2014 13:09:41 GMT -5
I find alot of material with that type of crust here in Southern California, Acton area. Thanks for the explaination. Is your material welded ash flow Tuff? Im not sure but they look exactly like what you have posted except they are moss not jasper. There are also nodules in the area with that type of crust and rarely they will be amethyst. I probably have some pieces from the area showing that type of crust in the workshop. Next time im over there i can take a couple pics.
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knifegirl
off to a rocking start
Member since July 2014
Posts: 24
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Post by knifegirl on Jul 28, 2014 9:34:46 GMT -5
Thanks for posting this up. Always wanting to learn more!
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