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
23 Sep-12:13:13 Will barite save the world? (Bob Kerr)
23 Sep-12:04:31 Re: possibilty of adding/publishing a pdf file to the forum? (Tobi)
23 Sep-10:55:10 Re: possibilty of adding/publishing a pdf file to the forum? (Jordi Fabre)
23 Sep-10:44:49 Possibilty of adding/publishing a pdf file to the forum? (Tobi)
23 Sep-10:27:51 Re: a tri-state galena and calcite (Rgangue)
23 Sep-07:07:50 Re: a tri-state galena and calcite (Edelmin)
23 Sep-04:26:34 Re: collection of volkmar stingl (Volkmar Stingl)
22 Sep-19:37:22 Re: a tri-state galena and calcite (John Hodgson)
22 Sep-17:04:03 The mizunaka collection - fluorite (Am Mizunaka)
22 Sep-15:23:18 Re: collection of sante celiberti (Sante Celiberti)
22 Sep-12:56:04 Re: a mineralogical trip through the states of usa - indiana (R Saunders)
22 Sep-11:24:13 Re: a tri-state galena and calcite (Rgangue)
22 Sep-10:56:01 Re: a tri-state galena and calcite (R Saunders)
22 Sep-10:21:58 Re: northern ireland, ireland collecting sites (Rgangue)
22 Sep-10:18:31 Re: a tri-state galena and calcite (Rgangue)
22 Sep-09:43:12 Re: a tri-state galena and calcite (R Saunders)
22 Sep-09:12:01 Re: a mineralogical trip through the states of usa - indiana (R Saunders)
22 Sep-08:22:04 Re: collection of david carter (David916)
22 Sep-04:50:48 Re: very nice amethyst in the railroad works in north of spain (Heat)
22 Sep-04:11:45 Re: collection of volkmar stingl (Volkmar Stingl)
22 Sep-03:22:44 Re: very nice amethyst in the railroad works in north of spain (Hans Cremers)
22 Sep-03:11:53 Re: quartz and epidote with possible hedenbergite from imilchil, morocco (Sante Celiberti)
21 Sep-16:58:02 Quartz and epidote with possible hedenbergite from imilchil, morocco (Adam)
21 Sep-14:00:15 Re: very nice amethyst in the railroad works in north of spain (James Catmur)
21 Sep-13:57:11 Re: very nice amethyst in the railroad works in north of spain (James Catmur)

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
84842


The time now is Sep 23, 2021 12:17

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.
Celestite geode in dolomite block? Or what, halite?
  
  Index -> What is it? - Where is it from?
Like


View previous topic :: View next topic  
Author Message

CornelDumitru




Joined: 27 Dec 2020
Posts: 4
Location: Constanta

View user's profile

Send private message

PostPosted: Jul 24, 2021 13:47    Post subject: Celestite geode in dolomite block? Or what, halite?  

Please help me identify the mineral composing the geodes.
The hardness is 3-4.
Taste is salty!
I can not see a reaction to LWUV.
The geodes are hosted in a block found on the shore of Lake Costinesti in Romania, close to the Black Sea shore. Suggesting Sarmatian Stage, salt water, evaporation, sedimentation.
The rock is, I would guess, mostly dolomite. It produces gas bubbles with vinegar, but in a calm reaction, not violently.
The crystals from geodes slowly dissolve in vinegar.
My first supposition was: halite geodes.
But the crystal habit, as I can show in photos attached (6-7 mm diagonal), does not look right for halite, to me.
So: celestite (celestine), halite, calcite, or what ?



20210723_141543.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  826 Time(s)

20210723_141543.jpg



20210723_141659.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  825 Time(s)

20210723_141659.jpg



WIN_20210131_14_16_36_Pro.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  821 Time(s)

WIN_20210131_14_16_36_Pro.jpg



WIN_20210131_14_06_28_Pro.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  824 Time(s)

WIN_20210131_14_06_28_Pro.jpg



WIN_20210131_13_54_33_Pro.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  824 Time(s)

WIN_20210131_13_54_33_Pro.jpg



WIN_20210131_13_51_34_Pro.jpg
 Mineral: unknown
 Description:
Dobrogea
variable
 Viewed:  821 Time(s)

WIN_20210131_13_51_34_Pro.jpg



WIN_20210131_13_45_10_Pro.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  820 Time(s)

WIN_20210131_13_45_10_Pro.jpg



WIN_20210131_13_42_13_Pro.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  821 Time(s)

WIN_20210131_13_42_13_Pro.jpg


Back to top
Reply to topic Reply with quote
Like
   

James Catmur
Site Admin



Joined: 14 Sep 2006
Posts: 872
Location: Cambridge


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jul 25, 2021 02:46    Post subject: Re: Celestite geode in dolomite block? Or what, halite?  

Given the taste, halite seems likely. Could the crystals be partially dissolved in water?
Back to top
Reply to topic Reply with quote
Like
   

Bob Morgan




Joined: 18 Jan 2018
Posts: 151
Location: Savannah, Georgia


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jul 25, 2021 08:13    Post subject: Re: Celestite geode in dolomite block? Or what, halite?  

The closeup shot 14-06-28 looks like a calcite crystal with the c-axis being where the bright spot is and the trigonal morphology around it.
Could the saltiness just be a coating from exposure to an external source of salt?
Back to top
Reply to topic Reply with quote
Like
   

CornelDumitru




Joined: 27 Dec 2020
Posts: 4
Location: Constanta

View user's profile

Send private message

PostPosted: Jul 25, 2021 10:49    Post subject: Re: Celestite geode in dolomite block? Or what, halite?  

James Catmur wrote:
Given the taste, halite seems likely. Could the crystals be partially dissolved in water?

I will do some testing tomorrow and take photos at intervals, thanks!


Bob Morgan wrote:
The closeup shot 14-06-28 looks like a calcite crystal with the c-axis being where the bright spot is and the trigonal morphology around it.
Could the saltiness just be a coating from exposure to an external source of salt?

Thanks! Yes that one... but the acute angles and the tabular structure shown in other shots?
Saltiness: it could be, given that the rock was (reportedly) plucked from a strip of land between a salty lake and a sea. I will pick a few crystals, clean them well and check the taste again.
Back to top
Reply to topic Reply with quote
Like
   

Don Lapham




Joined: 27 Jul 2021
Posts: 1
Location: Lockport, NY

View user's profile

Send private message

PostPosted: Jul 27, 2021 13:17    Post subject: Re: Celestite geode in dolomite block? Or what, halite?  

Celestite contains Strontium which would burn with a red color in a flame. Calcite and Halite contain Calcium and Sodium, respectively, which both burn orange. If you can crush a tiny portion of the crystal into a powder and carefully sprinkle it into a flame (preferably in a dark space) you should be able to see the red color of Strontium if it is present.
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 2006-2021


Powered by FMF