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Cause of Blue, Green and Blue/Green Coloration of Cookeite
  
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daviddillman




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PostPosted: Apr 28, 2017 08:16    Post subject: Cause of Blue, Green and Blue/Green Coloration of Cookeite  

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.

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Don Lum




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PostPosted: Apr 28, 2017 14:24    Post subject: Re: Cause of Blue, Green and Blue/Green Coloration of Cookeite  

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?

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alfredo
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PostPosted: May 01, 2017 20:27    Post subject: Re: Cause of Blue, Green and Blue/Green Coloration of Cookeite  

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




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PostPosted: May 03, 2017 09:12    Post subject: Re: Cause of Blue, Green and Blue/Green Coloration of Cookeite  

Thanks for the correction Alfredo. I was going by the ID associated with an image I had seen on FMF.
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Ed Huskinson




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PostPosted: May 03, 2017 18:02    Post subject: Re: Cause of Blue, Green and Blue/Green Coloration of Cookeite  

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.

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