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
19 Sep-21:53:54 Re: how common is pyrite disease? (Protium)
19 Sep-17:57:15 Re: how common is pyrite disease? (Pete Richards)
19 Sep-17:30:14 How common is pyrite disease? (Protium)
19 Sep-17:27:51 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-17:25:51 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-17:21:05 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-17:16:53 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-15:53:30 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-15:51:05 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-15:45:52 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-15:39:28 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-15:33:41 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-15:29:51 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-15:25:58 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-15:22:27 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-14:44:38 Re: denver gem and mineral show, 2017. spann style. (Bob Harman)
19 Sep-14:29:45 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-14:23:29 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-14:18:58 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-14:14:25 Re: denver gem and mineral show, 2017. spann style. (Gail)
19 Sep-13:18:54 Re: one more of....what is this? (Volkmar Stingl)
19 Sep-11:22:16 Re: one more of....what is this? (Kushmeja)
19 Sep-11:21:36 Re: collection of manuel mesa (Fiebre Verde)
19 Sep-11:12:53 Re: collection of manuel mesa (Manuel Mesa)
19 Sep-11:10:24 Re: one more of....what is this? (Josele)

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
32740


The time now is Sep 20, 2017 00:33

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Palmarejo Chihuahua: White material on Calcite
  
  Index -> What is it? - Where is it from?
Like


View previous topic :: View next topic  
Author Message

Jean Sendero
Site Admin



Joined: 20 Dec 2009
Posts: 242
Location: Tucson, Arizona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Apr 30, 2017 14:04    Post subject: Palmarejo Chihuahua: White material on Calcite  

On February 28, 2017 on the Tucson 2017 posts ( http://www.mineral-forum.com/message-board/viewtopic.php?p=55892#55892 ) Jordi mentioned the new calcite from Palmarejo, Municipio de Chinipas, Chihuahua with the reference to some white material:

“has surprised us this Tucson with huge pieces of large crystals of twinned Calcite, coated with a VERY white material that does not appear to be Calcite and with a second generation of crystals also of Calcite.”

After trimming my piece, and examining the fallen bits and pieces, it became obvious that this material appears to be fibrous.

I have been curious about this material and have yet to have it analyzed unless someone else had it done and wants to share the results.

Or does anyone have suggestions as to what it could be.

Cheers

Jean



1090ao - Calcite Palmajero Chinipas Chihuahua.jpg
 Mineral: Calcite
 Locality:
Palmarejo Mine, Palmarejo, Municipio Chinipas, Chihuahua, Mexico
 Dimensions: 15 x 10 x 13 cm high
 Description:
 Viewed:  1859 Time(s)

1090ao - Calcite Palmajero Chinipas Chihuahua.jpg



20170430_153820.jpg
 Mineral: Unknown
 Locality:
Palmarejo Mine, Palmarejo, Municipio Chinipas, Chihuahua, Mexico
 Dimensions: 2 cm tall
 Description:
Note the fibrous, fuzzy appearance of the white material on calcite.

Any idea what it can be?
 Viewed:  1858 Time(s)

20170430_153820.jpg


Back to top
Reply to topic Reply with quote
Like
   

lluis




Joined: 17 Nov 2006
Posts: 538

View user's profile

Send private message

PostPosted: Apr 30, 2017 14:27    Post subject: Re: Palmarejo Chihuahua: White material on Calcite  

Hi, Mr.Sendero

With some analysis of cations (seem alkalinoterrous for colour and site), and anion, we can guess something more properly...
Being fibrous and in Milpillas, and white, I would guess gypsum....

If you may send me a sample (small...very small), I can analyze that....
If sulfate and calcium, well, gypsum seems....

With best wishes

Lluís
Back to top
Reply to topic Reply with quote
Like
   

Jean Sendero
Site Admin



Joined: 20 Dec 2009
Posts: 242
Location: Tucson, Arizona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Apr 30, 2017 14:56    Post subject: Re: Palmarejo Chihuahua: White material on Calcite  

Thank you for offering Lluis.

I do not believe it is gypsum. It is not from Milpillas.

Cheers
Back to top
Reply to topic Reply with quote
Like
   

Bob Harman




Joined: 06 Nov 2015
Posts: 234
Location: Indiana


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Apr 30, 2017 15:02    Post subject: Re: Palmarejo Chihuahua: White material on Calcite  

The really white color and consistency suggested by your photos suggest mordenite, but I am no expert in these matters. BOB
Back to top
Reply to topic Reply with quote
Like
   

Jordi Fabre
Overall coordinator of the Forum



Joined: 07 Aug 2006
Posts: 3913
Location: Barcelona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Apr 30, 2017 15:38    Post subject: Re: Palmarejo Chihuahua: White material on Calcite  

Hi Jean,

I don't have analysis yet because César Menor is working in USA currently and if this white material is something like tremolite (for example) it could be a complex analysis, so I prefer wait for César 😊

On the meantime, as you already have some broken material could you please submerge a small parcel in dilute HCl just to check that is not Calcite?
Back to top
Reply to topic Reply with quote
Like
   

Peter Megaw
Site Admin



Joined: 13 Jan 2007
Posts: 780
Location: Tucson, Arizona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Apr 30, 2017 20:04    Post subject: Re: Palmarejo Chihuahua: White material on Calcite  

Just to toss in another possibility. I have several pieces with this stuff and have both cleaned it to remove smudges and tried to remove it where it detracts. It is very tenacious and does not like to clean. I have followed Jeans lead and agree with the fibrous nature and note that some appears to be included in the calcite which may explain the tenacity and difficulty in cleaning.

Palmarejo is a typical epithermal vein system so a skarn mineral like tremolite is unlikely as is gypsum. A zeolite is possible but I'd be surprised if these were so tenacious. I suspect palygorskite or related clay is more likely.

_________________
Siempre Adelante!
Back to top
Reply to topic Reply with quote
Like
   

Joseph D'Oliveira




Joined: 29 Jan 2012
Posts: 165
Location: Hanmer, Ontario


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Apr 30, 2017 20:35    Post subject: Re: Palmarejo Chihuahua: White material on Calcite  

Hi Jean, I'll add my 2 cents in. If it's a zeolite like mordenite, it can be difficult to remove and I have never been very successful at removing some mordenite especially at contact points with another mineral.

Peter may be right, because of the fibrous nature palygorskite might fit the bill.

_________________
Joseph D'Oliveira
Hanmer, Ontario
Canada
Back to top
Reply to topic Reply with quote
Like
   

Jean Sendero
Site Admin



Joined: 20 Dec 2009
Posts: 242
Location: Tucson, Arizona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: May 01, 2017 07:04    Post subject: Re: Palmarejo Chihuahua: White material on Calcite  

I agree with Peter, I didn't want to mention it but some is partially included in the calcite. And considering the deposit type, a side with Peter as well, difficult for it to be tremolite.

Joe, I do not want to remove it. I simply want to know what the stuff is. On the two pieces that I have, I do not see it as something detracting at all.

I'm in Tucson in a few days and will have it analyzed. Hopefully, a solution can be found.

We have two suggestions, mordenite (thanks to Bob) and palygorskite (thanks to Peter).

Cheers

J
Back to top
Reply to topic Reply with quote
Like
   

Jordi Fabre
Overall coordinator of the Forum



Joined: 07 Aug 2006
Posts: 3913
Location: Barcelona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: May 01, 2017 07:33    Post subject: Re: Palmarejo Chihuahua: White material on Calcite  

Jordi Fabre wrote:
...if this white material is something like tremolite (for example) it could be a complex analysis...

Sorry to disagree but the Tremolite is not uncommon in skarn-type tin-iron deposits like Huanggang and others. On the other hand and by my knowledge the Zeolites are not common on the skarns.

Anyway, I don't suggest Tremolite, it was just an example of one of the hard-to-analyze minerals that this white fibrous material could be. The analysis will tell...
Back to top
Reply to topic Reply with quote
Like
   

Jean Sendero
Site Admin



Joined: 20 Dec 2009
Posts: 242
Location: Tucson, Arizona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: May 01, 2017 09:45    Post subject: Re: Palmarejo Chihuahua: White material on Calcite  

Agree. Let's leave it until the analysis comes back.

Cheers
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> What is it? - Where is it from?   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 2006-2017


Powered by FMF