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
22 Nov-07:21:12 Re: new generation for picture - ploum (Ploum)
22 Nov-03:56:24 Re: new generation for picture - ploum (Pierre Joubert)
22 Nov-03:09:39 Re: new generation for picture - ploum (Tobi)
21 Nov-22:04:25 Re: munich show (mineralientage) 2017 (Roger Warin)
21 Nov-21:33:30 Re: munich show (mineralientage) 2017 (Roger Warin)
21 Nov-15:55:24 Re: the mizunaka collection (Philippe Durand)
21 Nov-15:22:37 Re: mineral names in different languages and their meaning (Pete Richards)
21 Nov-13:43:39 Re: new generation for picture - ploum (Ploum)
21 Nov-13:35:45 Re: mineral names in different languages and their meaning (Tobi)
21 Nov-12:27:46 Re: micro photos of inclusions in quartz (Zbhjzm)
21 Nov-11:20:15 Re: rarest quartz twins with inclined axes c (Reef)
21 Nov-10:11:59 Re: mineral names in different languages and their meaning (Pete Richards)
21 Nov-04:25:25 Re: mineral names in different languages and their meaning (Tobi)
21 Nov-04:21:11 Re: in memoriam: adalberto giazotto (1940-2017) (Tobi)
21 Nov-04:17:44 Re: mineral names in different languages and their meaning (Pierre Joubert)
21 Nov-03:40:43 Re: mineral names in different languages and their meaning (Tobi)
21 Nov-02:38:54 Re: mineral names in different languages and their meaning (Jm)
21 Nov-02:19:38 Re: micro photos of inclusions in quartz (Zbhjzm)
20 Nov-19:15:32 Re: franjungle collection (Franjungle)
20 Nov-18:11:57 Re: is this zircon ? (Dimce Catle)
20 Nov-17:35:46 Re: questions about microcline (Josele)
20 Nov-15:48:34 The mizunaka collection - copper (Am Mizunaka)
20 Nov-15:47:11 Re: is this zircon ? (Pete Modreski)
20 Nov-15:27:59 Re: mineral names in different languages and their meaning (Peter)
20 Nov-15:19:19 Re: is this zircon ? (Lluis)

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
35595


The time now is Nov 22, 2017 09:57

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Bluish crystal ID
  
  Index -> What is it? - Where is it from?
Like
2


View previous topic :: View next topic  
Author Message

Robson Vieira




Joined: 05 Jan 2017
Posts: 10
Location: São Paulo

View user's profile

Send private message

PostPosted: Jan 11, 2017 16:28    Post subject: Bluish crystal ID  

Hello there! I would like to ask your help to identify a mineral on matrix. The mineral is too small, so I could not measure and test its properties. If the images allow, please tell me about it. It was found at an Ignimbrite quarry, and the minerals associated are laser Quartz, Goethite, Epidote and Pyrite. The crystals I want to identify are bluish to in color. To me, they look like Analcime, due to the crystal habit, but the bluish color I doubt, because I have never seen blue analcime, perhaps I'm mistaken.


SAM_2922.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
 Viewed:  1903 Time(s)

SAM_2922.JPG



SAM_2923.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
 Viewed:  1895 Time(s)

SAM_2923.JPG



SAM_2926.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
 Viewed:  1899 Time(s)

SAM_2926.JPG



SAM_2928.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
 Viewed:  1902 Time(s)

SAM_2928.JPG



SAM_2929.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
Microphoto attempt...
 Viewed:  1900 Time(s)

SAM_2929.JPG


Back to top
Reply to topic Reply with quote
Like
   

Bob Carnein




Joined: 22 Aug 2013
Posts: 78
Location: Florissant, CO

View user's profile

Send private message

PostPosted: Jan 11, 2017 17:29    Post subject: Re: Bluish crystal ID  

The matrix doesn't look like any ignimbrites I have seen; do you know why they were quarrying ignimbrite? (Sometimes, the first step in IDing any mineral is to establish the identity of the host rock.)
Back to top
Reply to topic Reply with quote
Like
   

Robson Vieira




Joined: 05 Jan 2017
Posts: 10
Location: São Paulo

View user's profile

Send private message

PostPosted: Jan 11, 2017 18:55    Post subject: Re: Bluish crystal ID  

Hi Bob,
Thank you for responding. There is a goethite and quartz layer under the unknown mineral. I realize the Ignimbrite matrix does not appear in the picture, but surely I'm going to confirm whether it is Ignimbrite or not. The quarry was extracting materials for building and road construction. ...
Back to top
Reply to topic Reply with quote
Like
   

Bob Carnein




Joined: 22 Aug 2013
Posts: 78
Location: Florissant, CO

View user's profile

Send private message

PostPosted: Jan 11, 2017 21:29    Post subject: Re: Bluish crystal ID  

My "first guess" would be calcite. I would use a needle to check hardness (less than steel) and pick off a single crystal, crush it on a piece of glass or pottery, and then drop some vinegar on it. There should be a very slow emission of bubbles if it is calcite.
Back to top
Reply to topic Reply with quote
Like
1
   

Riccardo Modanesi




Joined: 07 Nov 2011
Posts: 471
Location: Milano

View user's profile

Send private message

PostPosted: Jan 12, 2017 02:49    Post subject: Re: Bluish crystal ID  

Hi to everybody!
For what I saw in the first photo: what's more interesting are those small purplish crystals in the low sector of the rock. A sightseeing at the microscope should clear something more about.
Greetings from Italy by Riccardo.

_________________
Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
Back to top
Reply to topic Reply with quote
Like
1
   

Robson Vieira




Joined: 05 Jan 2017
Posts: 10
Location: São Paulo

View user's profile

Send private message

PostPosted: Jan 12, 2017 07:22    Post subject: Re: Bluish crystal ID  

Hi to all. Thanks Bob and Ricardo. I'm adding more pics to help a little bit. I tested the hardness (can you imagine the difficulty to do that with such a little thing?) which is about 3.5 to 4.0 because it scratches calcite quite easily, but it does not scratch a Fluorite crystal. The mineral does not fizz in vinegar. Could it be Fluorite? On another hand, under the microscope I was unable to see the characteristic cleavage of Fluorite. Have fun.


SAM_2931.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
Scratch on Calcite
 Viewed:  1698 Time(s)

SAM_2931.JPG



SAM_2933.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
The tool for hardness test. Works very well.
 Viewed:  1690 Time(s)

SAM_2933.JPG



SAM_2934.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
A single crystal. Not much developer though.
 Viewed:  1691 Time(s)

SAM_2934.JPG



SAM_2935.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
An Ignimbrite i referred.
 Viewed:  1690 Time(s)

SAM_2935.JPG


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