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daviddillman
Joined: 04 Dec 2010
Posts: 51
Location: Texas
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Posted: Apr 28, 2017 08:16 Post subject: Cause of Blue, Green and Blue/Green Coloration of Cookeite |
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Is there any analytical work that explains the occasional blue, green, or blue/green coloration of cookeite? More specifically the blue and green cookeite found at this locality:
Stand-on-Your-Head No. 1 Mine, Bland, Saline County, Arkansas, USA?
If there is not any analytical work are there plausible theories?
This locality has also produced some cookeite with similar coloration: Obira Mine, Bungo-Ohno City, Oita Prefecture, Kyushu Region, Japan. I have the same questions regarding this cookeite.
Thanks in advance. _________________ DSD |
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Don Lum
Joined: 03 Sep 2012
Posts: 2868
Location: Arkansas
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Posted: Apr 28, 2017 14:24 Post subject: Re: Cause of Blue, Green and Blue/Green Coloration of Cookeite |
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daviddillman wrote: | Is there any analytical work that explains the occasional blue, green, or blue/green coloration of cookeite? More specifically the blue and green cookeite found at this locality:
Stand-on-Your-Head No. 1 Mine, Bland, Saline County, Arkansas, USA?
If there is not any analytical work are there plausible theories?
This locality has also produced some cookeite with similar coloration: Obira Mine, Bungo-Ohno City, Oita Prefecture, Kyushu Region, Japan. I have the same questions regarding this cookeite.
Thanks in advance. |
David, I looked up the chemical formula of Cookeite (Al,Li)3Al2(Si,Al)4O10(OH)8 and know that Cookeite is part of the Chlorite Group. Is the cause of the green color in the Cookeite from SOYH the same as what causes Chlorite ((Fe, Mg, Al)6(Si, Al)4O10(OH)8) to look green? _________________ hogwild |
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alfredo
Site Admin
Joined: 30 Jan 2008
Posts: 981
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Posted: May 01, 2017 20:27 Post subject: Re: Cause of Blue, Green and Blue/Green Coloration of Cookeite |
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By the way, the so-called "cookeite" that David mentioned from the Obira mine isn't really cookeite. That was just a visual ID a long time ago based on its resemblance to Arkansas cookeite. Analysis showed it to be chamosite. |
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daviddillman
Joined: 04 Dec 2010
Posts: 51
Location: Texas
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Posted: May 03, 2017 09:12 Post subject: Re: Cause of Blue, Green and Blue/Green Coloration of Cookeite |
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Thanks for the correction Alfredo. I was going by the ID associated with an image I had seen on FMF. _________________ DSD |
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Ed Huskinson
Joined: 15 Apr 2009
Posts: 318
Location: Kingman, Arizona
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Posted: May 03, 2017 18:02 Post subject: Re: Cause of Blue, Green and Blue/Green Coloration of Cookeite |
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I'll just break in here.
I like the idea of pronouncing it cookie-ite. Kind of silly I know, but hey, sometimes I think we need more silly. For years I pronounced whewellite as "wee-wellite". Since then I've learned otherwise, but over the phone, people have misconstrued the topic to have jumped to wavellite.
Still, I'm enjoying all of the topics thus far, although I do miss the fadens..
More later,
Ed in Kingman. _________________ La respuesta está en las rocas!! Estudiadlas!!
Ed |
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