We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences

FMF English Forum is moderated by John S. White and Peter Megaw
 

Spanish message board






Newest topics and users posts
27 Apr-01:17:46 The mizunaka collection - rhodochrosite (Am Mizunaka)
27 Apr-01:11:26 Re: collection of heimo hellwig (Heimo Hellwig)
26 Apr-12:54:53 Re: agates in sicily? (Gagat Minerals)
26 Apr-12:25:54 Re: franjungle collection (Franjungle)
26 Apr-12:21:21 Re: collection of carles millan (Franjungle)
26 Apr-11:57:22 Re: collection of michael shaw (Crosstimber)
26 Apr-11:49:50 Re: agates in sicily (Riccardo Modanesi)
26 Apr-11:49:44 Re: is this a meteorite (Nova2000)
26 Apr-10:57:15 Re: is this a meteorite (Jordi Fabre)
26 Apr-10:11:26 Re: is this a meteorite (Peter Lemkin)
26 Apr-10:09:17 Re: is this a meteorite (Peter Megaw)
26 Apr-09:18:03 Re: is this a meteorite (Kushmeja)
26 Apr-09:04:57 Is this a meteorite? (Lone)
26 Apr-06:02:45 Re: collection of carles millan (Enrique Llorens)
26 Apr-02:52:04 Collection of carles millan - beryl and muscovite from pakistan (Carles Millan)
25 Apr-20:56:54 The mizunaka collection - rhodochrosite with pyrite (Am Mizunaka)
25 Apr-14:20:07 Re: new generation for picture - ploum (Ploum)
25 Apr-12:07:16 Re: agates in sicily (Alanbartlett)
25 Apr-11:53:31 Re: the mizunaka collection (Am Mizunaka)
25 Apr-11:35:15 Re: collection of michael shaw (Crosstimber)
25 Apr-11:16:01 Re: agates in sicily (Marco Campos-venuti)
25 Apr-11:09:18 Re: agates in sicily (James)
25 Apr-10:59:28 Re: agates in sicily (Alanbartlett)
25 Apr-10:52:28 Re: agates in sicily (James)
25 Apr-10:35:57 Re: how to start a new topic (Alanbartlett)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
42162


The time now is Apr 27, 2018 03:25

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Cause of Blue, Green and Blue/Green Coloration of Cookeite
  
  Index -> Minerals and Mineralogy
Like
2


View previous topic :: View next topic  
Author Message

daviddillman




Joined: 04 Dec 2010
Posts: 51
Location: Texas

View user's profile

Send private message

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.

_________________
DSD
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 1881
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

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?

_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

alfredo
Site Admin



Joined: 30 Jan 2008
Posts: 690
Location: New York


Access to the FMF Gallery title=

View user's profile

Send private message

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.
Back to top
Reply to topic Reply with quote
Like
1
   

daviddillman




Joined: 04 Dec 2010
Posts: 51
Location: Texas

View user's profile

Send private message

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.
_________________
DSD
Back to top
Reply to topic Reply with quote
Like
   

Ed Huskinson




Joined: 15 Apr 2009
Posts: 309
Location: Kingman, Arizona


Access to the FMF Gallery title=

View user's profile

Send private message

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.

_________________
La respuesta está en las rocas!! Estudiadlas!!
Ed
Back to top
Reply to topic Reply with quote
Like
1
   
Display posts from previous:   
   Index -> Minerals and Mineralogy   All times are GMT - 5 Hours
Page 1 of 1
    

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


All pictures, text, design © Forum FMF 2006-2018


Powered by FMF