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Fluorite twin mistery
  
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marco campos-venuti




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PostPosted: Apr 03, 2024 13:49    Post subject: Fluorite twin mistery  

We all have drawers full of samples that we don't know what they are. Some day I wake up a little bit Poirot and I start investigating one of those samples, but since I can't solve the mystery, I propose it to you.
It is a sample that I purchased at La Union Mineral Show (Spain) in 2006 for 5 euros and without any label, in a 4x4 box. It is a clear fluorite crystal, twinned according to the spinel law.
The clues I can give you are:
1) on the back there are some hematite crystals attached, some of which are also included in the fluorite, so it seems clear that the now loose crystal originally rested on a layer of crystallized specularitic hematite.
2) the fluorite fluoresces pink at shortwaves UV.
Do you have any suggestions?



433834118_442688738131502_3249908273303738576_n.jpg
 Mineral: Fluorite
 Description:
Spinel law twinned crystal
 Viewed:  884 Time(s)

433834118_442688738131502_3249908273303738576_n.jpg



432800208_1615693155850517_1222748157727271374_n.jpg
 Mineral: Fluorite
 Description:
Spinel law twinned crystal
 Viewed:  881 Time(s)

432800208_1615693155850517_1222748157727271374_n.jpg



433766286_4477762642448337_1994737727073033315_n.jpg
 Mineral: Fluorite, hematite
 Description:
Back side
 Viewed:  886 Time(s)

433766286_4477762642448337_1994737727073033315_n.jpg



433969652_440594835147917_9000428984639308994_n.jpg
 Mineral: Fluorite
 Description:
Pink under UV shortwaves
 Viewed:  880 Time(s)

433969652_440594835147917_9000428984639308994_n.jpg


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Jordi Fabre
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PostPosted: Apr 03, 2024 16:42    Post subject: Re: Fluorite twin mistery  

Very difficult, Marco. Its association with that 'kind-of-alpine' Hematite, rules out several possible origins, and the date and place where you bought it practically rule out Huanggang.
Let's hope for the best, but perhaps we won't be able to identify the locality in this case...
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Josele




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PostPosted: Apr 03, 2024 16:58    Post subject: Re: Fluorite twin mistery  

Just commenting that the only fluorite fluorescing red that I remember is Mexican.
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