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


Spanish message board






Newest topics and users posts
03 Dec-11:11:35 Re: hardin or elmwood fluorite? (Juan Roberto Rivera)
03 Dec-10:41:40 Uk locality help (Michael Shaw)
03 Dec-04:45:26 Re: collection of michael shaw (James Catmur)
03 Dec-03:02:41 Re: hardin or elmwood fluorite? (Tobi)
02 Dec-17:39:50 Re: hardin or elmwood fluorite? (Jordi Fabre)
02 Dec-15:00:51 Re: collection of michael shaw (Michael Shaw)
02 Dec-12:21:29 Re: hardin or elmwood fluorite? (Juan Roberto Rivera)
02 Dec-11:32:38 Re: collection of michael shaw (James Catmur)
02 Dec-10:08:36 Re: collection of michael shaw (Michael Shaw)
02 Dec-04:07:54 Re: hardin or elmwood fluorite? (James Catmur)
02 Dec-00:14:35 Re: collection of volkmar stingl (Volkmar Stingl)
01 Dec-20:34:06 Re: hardin or elmwood fluorite? (Juan Roberto Rivera)
01 Dec-20:12:14 Re: hardin or elmwood fluorite? (Matt_zukowski)
01 Dec-10:18:34 Re: hardin or elmwood fluorite? (Juan Roberto Rivera)
01 Dec-10:17:05 Hardin or elmwood fluorite? (Juan Roberto Rivera)
01 Dec-09:14:21 Re: lego rhodochrosite, amethyst geode, black tourmaline with aquamarine, orange quartz, e (Juan Roberto Rivera)
01 Dec-09:11:12 Re: lego rhodochrosite, amethyst geode, black tourmaline with aquamarine, orange quartz, e (Juan Roberto Rivera)
30 Nov-00:46:53 Re: collection of volkmar stingl (Volkmar Stingl)
29 Nov-17:09:03 The mizunaka collection - quartz (Am Mizunaka)
29 Nov-10:12:19 Re: collection of michael shaw - crocoite (Michael Shaw)
28 Nov-05:07:29 Re: can't read / decode this label to identify the fluorite location... (Andyh)
28 Nov-04:02:27 Re: can't read / decode this label to identify the fluorite location... (Caf2_4_me)
27 Nov-15:47:59 Re: can't read / decode this label to identify the fluorite location... (Lluis)
27 Nov-10:26:05 Re: collection of volkmar stingl (Volkmar Stingl)
27 Nov-10:00:29 Re: can't read / decode this label to identify the fluorite location... (Tobi)

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
116445


The time now is Dec 03, 2024 15:11

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
Verdelite & Quartz ?
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
Like
12


View previous topic :: View next topic  
Author Message

Mathias




Joined: 01 Apr 2018
Posts: 148
Location: Vlodrop

View user's profile

Send private message

PostPosted: Sep 22, 2024 06:16    Post subject: Verdelite & Quartz ?  

Some time ago I've purchased a specimen with the label:
Verdelite & Quartz, Taquaral, Minas Gerais.
It is like a large green Verdelite crystal but the inside of it completely consists of presumably Quartz. Has anyone ever seen such similar specimen? The interior, presumably Quartz, doesn't really have the appearance of Quartz. But perhaps it is.



DSC02604.JPG
 Description:
 Viewed:  1542 Time(s)

DSC02604.JPG



DSC02602.JPG
 Description:
 Viewed:  1543 Time(s)

DSC02602.JPG



DSC02588.JPG
 Description:
 Viewed:  1538 Time(s)

DSC02588.JPG



DSC02692.JPG
 Description:
 Viewed:  1535 Time(s)

DSC02692.JPG


Back to top
Reply to topic Reply with quote
Like
3
   

Tobi
Site Admin



Joined: 07 Apr 2009
Posts: 4187
Location: Germany


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Sep 22, 2024 08:39    Post subject: Re: Verdelite & Quartz ?  

Mathias wrote:
[...]It is like a large green Verdelite crystal but the inside of it completely consists of presumably Quartz. Has anyone ever seen such similar specimen? The interior, presumably Quartz, doesn't really have the appearance of Quartz. But perhaps it is.
Hi Mathias, yes, I have seen similiar pieces from Brazil: The Urubu Mine produced green tourmalines that are hollow and have an interior of quartz.
Here's information about that mine: https://www.mindat.org/loc-7723.html
Maybe there are other localities in Brazil where this happened to the elbaite. Maybe your specimen is from Urubu. Anyway, it is possible that quartz replaces the core of an elbaite crystal, so you were correct in your assumption.

Regards
Tobi
Back to top
Reply to topic Reply with quote
Like
4
   

Mathias




Joined: 01 Apr 2018
Posts: 148
Location: Vlodrop

View user's profile

Send private message

PostPosted: Sep 22, 2024 09:45    Post subject: Re: Verdelite & Quartz ?  

Hi Tobi thanks, this indeed seems plausible.
I wonder how this happens, from the inside to the outside it pseudomorphs into Quartz, as it seems. What would be the mechanism behind this metamorphosis?
Thanks again,
Mathias
Back to top
Reply to topic Reply with quote
Like
2
   

Tobi
Site Admin



Joined: 07 Apr 2009
Posts: 4187
Location: Germany


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Sep 23, 2024 05:44    Post subject: Re: Verdelite & Quartz?  

Mathias wrote:
Hi Tobi thanks, this indeed seems plausible.
I wonder how this happens, from the inside to the outside it pseudomorphs into Quartz, as it seems. What would be the mechanism behind this metamorphosis?
Thanks again, Mathias
To be honest, I have no idea about the details of this mechanism. You can ask me a lot of things concerning mineral collecting and localities, but not about the chemistry and the physics of crystal growth, I'm sorry.
But I know there are several people here in this forum with a lot of specialist knowledge about this scientific aspect of the hobby. So maybe you'll get an answer, I would also be interested to know how and why this happens.

Regards
Tobi
Back to top
Reply to topic Reply with quote
Like
2
   

lluis




Joined: 17 Nov 2006
Posts: 717

View user's profile

Send private message

PostPosted: Sep 23, 2024 12:49    Post subject: Re: Verdelite & Quartz ?  

Just a small question....
I saw in the link that Tobi provided, that the pseudomorph is "fibrous quartz", which makes me easier to understand pseudomorphing.
But in the example presented, I am unable to see "fibrous".
I see more a compact mineral..
May anyone of listizens bring me light on that? It is fibrous or it is compact?

With best wishes

Lluís
Back to top
Reply to topic Reply with quote
Like
   

John S. White
Site Admin



Joined: 04 Sep 2006
Posts: 1298
Location: Stewartstown, Pennsylvania, USA


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Sep 24, 2024 14:56    Post subject: Re: Verdelite & Quartz ?  

Sure looks like tourmaline to me. Hollow tourmalines are common so quartz-filled tourmalines are known.
_________________
John S. White
aka Rondinaire
Back to top
Reply to topic Reply with quote
Like
   

Bob Morgan




Joined: 18 Jan 2018
Posts: 234
Location: Savannah, Georgia


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Sep 24, 2024 15:50    Post subject: Re: Verdelite & Quartz ?  

Mike Wise showed a photo of a spectacular specimen at the Mineral Section of the Rochester Academy of Science a few years ago. It was a several inches tall green Tourmaline with a large well developed quartz crystal nested in the middle.
Back to top
Reply to topic Reply with quote
Like
1
   
Display posts from previous:   
   Index -> FOR BEGINNERS: 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 2006-2024


Powered by FMF