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Celestite geode in dolomite block? Or what, halite?
  
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CornelDumitru




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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:  923 Time(s)

20210723_141543.jpg



20210723_141659.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  923 Time(s)

20210723_141659.jpg



WIN_20210131_14_16_36_Pro.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  919 Time(s)

WIN_20210131_14_16_36_Pro.jpg



WIN_20210131_14_06_28_Pro.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  924 Time(s)

WIN_20210131_14_06_28_Pro.jpg



WIN_20210131_13_54_33_Pro.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  922 Time(s)

WIN_20210131_13_54_33_Pro.jpg



WIN_20210131_13_51_34_Pro.jpg
 Mineral: unknown
 Description:
Dobrogea
variable
 Viewed:  919 Time(s)

WIN_20210131_13_51_34_Pro.jpg



WIN_20210131_13_45_10_Pro.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  918 Time(s)

WIN_20210131_13_45_10_Pro.jpg



WIN_20210131_13_42_13_Pro.jpg
 Mineral: unknown
 Description:
locality: Dobrogea
size: variable
 Viewed:  919 Time(s)

WIN_20210131_13_42_13_Pro.jpg


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James Catmur
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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?
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Bob Morgan




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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?
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CornelDumitru




Joined: 27 Dec 2020
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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.
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Don Lapham




Joined: 27 Jul 2021
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Location: Lockport, NY

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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.
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