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  Index -> What is it? - Where is it from?
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Dany Mabillard




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PostPosted: Jan 28, 2021 11:30    Post subject: Help needed  

Hello everybody,

I need some help to confirm or invalidate the following mineral. If you also have a more precise location, I'll be very grateful.

Thanks in advance and keep safe.

Dany.



Spessartine - Microcline no 209 - FMF.jpg
 Mineral: Spessartine
 Locality:
Tongbei, Yunxiao, Zhangzhou Prefecture, Fujian Province, China
 Dimensions: 49 mm x 40 mm x 26 mm
 Description:
For the vendor, it's on Orthoclase but I think is on Microcline. What do you think?
 Viewed:  2387 Time(s)

Spessartine - Microcline no 209 - FMF.jpg


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Volkmar Stingl




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PostPosted: Jan 28, 2021 11:40    Post subject: Re: Help needed  

Hello Dany,

this is a specimen with smoky quartz, spessartine, and orthoclase from Tongbei, Yunxiao Co., Zhangzhou Prefecture, Fujian Province in China.

Volkmar
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Michael Shaw
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PostPosted: Jan 28, 2021 13:50    Post subject: Re: Help needed  

Dany,

As you suggest, the feldspar that that is associated with the Spessartine and Smoky Quartz is Microcline, not Orthoclase. It was originally reported to be Orthoclase, but this has been proven wrong.
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Dany Mabillard




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PostPosted: Jan 29, 2021 11:00    Post subject: Re: Help needed  

Volkmar Stingl wrote:
Hello Dany,

this is a specimen with smoky quartz, spessartine, and orthoclase from Tongbei, Yunxiao Co., Zhangzhou Prefecture, Fujian Province in China.

Volkmar


Thank you for your help. I've checked the location on Mindat and there is this note: The feldspar associated with the spessartine is microcline, not orthoclase as originally reported.
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Dany Mabillard




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PostPosted: Jan 29, 2021 11:26    Post subject: Re: Help needed  

Michael Shaw wrote:
Dany,

As you suggest, the feldspar that that is associated with the Spessartine and Smoky Quartz is Microcline, not Orthoclase. It was originally reported to be Orthoclase, but this has been proven wrong.


Thank you for your help.
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alfredo
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PostPosted: Jan 29, 2021 15:29    Post subject: Re: Help needed  

Let's keep in mind that the differences between orthoclase and microcline are so small that they are only kept as separate species because of historical inertia. If they were described as new species nowadays, under current IMA rules, they'd just be a single species. So, in my own collection I label them "K-feldspar" and don't give a hoot which one of them it is, orthoclase or microcline.
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Pete Richards
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PostPosted: Jan 29, 2021 16:00    Post subject: Re: Help needed  

On top of that, orthoclase becomes microcline as it cools down, if it has time. And there is debate about whether there is such a thing as primary microcline - i.e. microcline that did not start out as orthoclase. The transition from orthoclase to microcline leads to a characteristic kind of twinning called cross-hatch or tartan twinning; if it is present the mineral is microcline, but this may require thin sections and microscopy to determine. If it is absent, the mineral could be orthoclase or it still possibly could be microcline - the elusive primary microcline. Probably most if not all k-spar crystals start out as orthoclase, probably most wind up as microcline pseudomorphs after orthoclase.

This ignores sanidine and adularia, other important forms of potassium feldspar. It's complex enough already!

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Dany Mabillard




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PostPosted: Jan 31, 2021 11:34    Post subject: Re: Help needed  

alfredo wrote:
Let's keep in mind that the differences between orthoclase and microcline are so small that they are only kept as separate species because of historical inertia. If they were described as new species nowadays, under current IMA rules, they'd just be a single species. So, in my own collection I label them "K-feldspar" and don't give a hoot which one of them it is, orthoclase or microcline.


Thank you. I'll use K Feldspar.
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Dany Mabillard




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PostPosted: Jan 31, 2021 11:34    Post subject: Re: Help needed  

Pete Richards wrote:
On top of that, orthoclase becomes microcline as it cools down, if it has time. And there is debate about whether there is such a thing as primary microcline - i.e. microcline that did not start out as orthoclase. The transition from orthoclase to microcline leads to a characteristic kind of twinning called cross-hatch or tartan twinning; if it is present the mineral is microcline, but this may require thin sections and microscopy to determine. If it is absent, the mineral could be orthoclase or it still possibly could be microcline - the elusive primary microcline. Probably most if not all k-spar crystals start out as orthoclase, probably most wind up as microcline pseudomorphs after orthoclase.

This ignores sanadine and adularia, other important forms of potassium feldspar. It's complex enough already!



Thank you for your explanation.
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Dany Mabillard




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PostPosted: Mar 07, 2021 08:22    Post subject: Re: Help needed  

Hello everybody,

I'd like a confirmation and maybe a more precise location for the following specimen.

Thank you in advance.

Have a great Sunday and keep safe.



Hematite no 214 - FMF.jpg
 Mineral: Hematite
 Locality:
Switzerland
 Dimensions: 180 mm x 120 mm x 50 mm
 Description:
 Viewed:  1196 Time(s)

Hematite no 214 - FMF.jpg



Hematite no 214 - 2 - FMF.jpg
 Mineral: Hematite
 Locality:
Switzerland
 Dimensions: 10 mm x 5 mm x 2 mm for the biggest one.
 Description:
 Viewed:  1196 Time(s)

Hematite no 214 - 2 - FMF.jpg


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Pete Richards
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PostPosted: Mar 07, 2021 08:24    Post subject: Re: Help needed  

Most likely hematite, but it could be ilmenite as well.
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James Catmur
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PostPosted: Mar 07, 2021 11:27    Post subject: Re: Help needed  

Do we assume it is Swiss?

Dany Mabillard wrote:
Hello everybody,

I'd like a confirmation and maybe a more precise location for the following specimen.

Thank you in advance.

Have a great Sunday and keep safe.
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Sante Celiberti




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PostPosted: Mar 07, 2021 11:32    Post subject: Re: Help needed  

Pete Richards wrote:
Most likely hematite, but it could be ilmenite as well.


Hi, Pete. I sincerely hope you are fine.
I agree with Hematite (ilmenite, present in our Alps with this same shape, is far rarer although possible...).
A warm greeting and stay healthy.

Dany,
if the matrix is a granular adularia, almost surely the specimen comes from Scherbadung area (Monte Cervandone).
Little quartz crystals can accompain the hematite and, often, on the pinacoidal faces of the ditrigonal bipyramids tiny red prismatic crystals of rutile can be in epitaxy.
Hope this helps. Stay safe.

Sante
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Sante Celiberti




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PostPosted: Mar 07, 2021 11:45    Post subject: Re: Help needed  

James Catmur wrote:
Do we assume it is Swiss?


You are right, James!
I assumed it is with too much superficiality... Sorry.
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Dany Mabillard




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PostPosted: Mar 10, 2021 10:15    Post subject: Re: Help needed  

Hello everybody,

thank you all for your comments. I'll try to get more information about the provenance of the Hematite (at least the country).

Keep safe and have a nice day.
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Dany Mabillard




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PostPosted: Mar 12, 2021 11:54    Post subject: Re: Help needed  

Hello everybody,

The seller confirms that the Hematite is from Switzerland. I'll try to find more information.

Have a nice weekend and keep safe.

Dany.
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James Catmur
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PostPosted: Mar 12, 2021 13:47    Post subject: Re: Help needed  

I have added that information to the photos
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Dany Mabillard




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PostPosted: Mar 13, 2021 14:52    Post subject: Re: Help needed  

James Catmur wrote:
I have added that information to the photos


Thank you James. Have a nice weekend. Keep safe.

Dany.
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