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Please help identify

Posted by Cbates  
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Cbates
Please help identify
February 19, 2012 08:13PM
I think the red nodules are oolitic Bauxite. Not sure if black is Obsidian or Coal. If anyone has any ideas it would be greatly appreciated.
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D Mike Reinke
Re: Please help identify
February 19, 2012 10:50PM
Coal is a lot softer and lighter than obsidian, very much. Does the piece feel as heavy as a typical rock that size, or much lighter? Can you scratch it w/ a knife, or glass? it looks sawn. Do you know w/ what blade? It is a cool looking piece, where is it from?

Mike
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Vik Vanrusselt
Re: Please help identify
February 19, 2012 11:04PM 		be    
Just a guess, I have a specimen of Cristobalite in Obsidian from Yellowstone NP which looks quite like it...

Vik

Edit: Yellowstone, not Yosemite...



Edited 1 time(s). Last edit at 02/22/2012 10:11PM by Vik Vanrusselt.
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cbates
Re: Please help identify
February 22, 2012 05:08AM
Thanks for your comments. I finally found a picture of this rock in an old book. It is Orbicular Ocean Jasper from Sausalito, Ca. Found by Mr. Kinrade in the 60's.
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Steven Kittleson
Re: Please help identify
February 22, 2012 02:39PM
Wrong thread...oops!



Edited 1 time(s). Last edit at 02/22/2012 02:45PM by Steven Kittleson.
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Steven Kittleson
Re: Please help identify
February 22, 2012 02:43PM
Cbates,

Looks like some killer material for some lap work.

Steve


To absent friends...in memory...still bright.
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Steven Kittleson
Re: Please help identify
February 22, 2012 05:03PM
Vik,

If you have a specimen from Yosemite National Park, it was obtained illegally...LOL. That is, if it was after the national park system was inaugurated. The last time I heard, it was illegal to harvest anything from a U.S. national park, reservation, sanctuary, etc. I was sorely tempted when I visited the Petrified Forest many years ago.

Steve


To absent friends...in memory...still bright.
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Alfredo Petrov
Re: Please help identify
February 22, 2012 05:35PM
Vik is most likely confused about the locality. California cristobalite in obsidian is unlikely to be from Yosemite; more likely Coso Hot Springs in Inyo county or Cougar Butte in Siskiyou county.
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Vik Vanrusselt
Re: Please help identify
February 22, 2012 10:10PM 		be    
Makes me wonder about all the other specimens from 'national parks' here on Mindat, and whether they were obtained legally or not smiling smiley

The picture I just took of my specimen is not perfect, but good enough to get a location I think. Yellowstone or not?

Vik
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