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what is this? A purple tourmaline grown out from the base of a skeletal quartz?
  
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RheinSte




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PostPosted: Aug 14, 2024 12:59    Post subject: what is this? A purple tourmaline grown out from the base of a skeletal quartz?  

Hello folks!
Recently I have seen a specimen but the owner has not yet confirm the identity of the purple crystal that grow out from the base of this smoky skeletal quartz. The origin of this specimen might be Madagascar. The guess about this crystal is tourmaline, but purple tourmaline is usually a rare case.

I appreciate any insights you can provide.



Screenshot_20240815_014005.jpg
 Dimensions: 1.8cm*0.5cm*0.5cm
 Description:
the stated dimension is of the purple mineral only
 Viewed:  2195 Time(s)

Screenshot_20240815_014005.jpg



Screenshot_20240815_014013.jpg
 Description:
 Viewed:  2190 Time(s)

Screenshot_20240815_014013.jpg



Screenshot_20240815_013956.jpg
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 Viewed:  2193 Time(s)

Screenshot_20240815_013956.jpg


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Matt_Zukowski
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PostPosted: Aug 14, 2024 13:33    Post subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz?  

Could be apatite. Are there and small broken xtals that you can remove and use for harness, etc tests?
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Jordi Fabre
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PostPosted: Aug 14, 2024 14:00    Post subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz?  

RheinSte wrote:
...but purple tourmaline is usually a rare case...

Matt is right; it could be Apatite, but Fluor-liddicoatite can also have a similar purple color.



Fluor-liddicoatite with Quartz - Sahatany Valley_Madagascar.jpg
 Mineral: Fluor-liddicoatite with Quartz
 Locality:
Sahatany Valley (Mt. Ibity), Vakinankaratra Region, Antananarivo Province, Madagascar
 Dimensions: 2.5 × 1.7 × 1.3 cm
 Description:
Specimen and photo: #MVM (Minerals - Virtual Museum)
 Viewed:  2169 Time(s)

Fluor-liddicoatite with Quartz - Sahatany Valley_Madagascar.jpg



Fluor-liddicoatite with Quartz - Sahatany Valley_Madagascar-top.jpg
 Mineral: Fluor-liddicoatite
 Locality:
Sahatany Valley (Mt. Ibity), Vakinankaratra Region, Antananarivo Province, Madagascar
 Dimensions: 2.5 × 1.7 × 1.3 cm
 Description:
Top of the same specimen

Specimen and photo: #MVM (Minerals - Virtual Museum)
 Viewed:  2167 Time(s)

Fluor-liddicoatite with Quartz - Sahatany Valley_Madagascar-top.jpg


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Roger Warin




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PostPosted: Aug 14, 2024 14:35    Post subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz?  

Sorry, Jordi,
I see a ternary axis. So it's a tourmaline, which is not unusual for the locality
probably Mount Ibity Area.
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Jordi Fabre
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PostPosted: Aug 14, 2024 15:45    Post subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz?  

Roger Warin wrote:
Sorry, Jordi,
I see a ternary axis. So it's a tourmaline, which is not unusual for the locality
probably Mount Ibity Area.

Not to contradict you, Roger, but Fluor-liddicoatites, being members of the Tourmaline group, belong to the trigonal crystal system, which indeed has a ternary axis.
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RheinSte




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PostPosted: Aug 19, 2024 21:14    Post subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz?  

Unfortunately, I cannot request any destructive tests from the owner. However, he appears to be interested in an analytical test that will be available in his city in the coming days. Hopefully, he will send the sample there, and I will receive the answer by then
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RheinSte




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PostPosted: Aug 28, 2024 04:12    Post subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz?  

NEW UPDATE:
The owner sent the specimen for Raman spectroscopy analysis. The spectrum indicates the purple mineral is Amethyst.
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Pete Richards
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PostPosted: Aug 28, 2024 14:11    Post subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz?  

I am sorry, but I think it is very unlikely that the purple prism is amethyst. Perhaps there is a thin film of quartz on the purple mineral that gave a deceptive reading.
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Roger Warin




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PostPosted: Aug 28, 2024 14:59    Post subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz?  

I am surprised by these hesitations.
It seems obvious to me that the morphology of this crystal and its appearance say that it is a tourmaline.
I think it is Malagasy.
The distinction between the 2 species elbaite / liddicoatite is not obvious. Both species are present.
It is true that in the past liddicoatites made Madagascar and the Mount Ibi region famous.
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