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Euclase, an equant crystal
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Roger Warin




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PostPosted: Sep 15, 2013 08:54    Post subject: Euclase, an equant crystal  

Hi,
Here is a good example of equant crystal of euclase. Origin: Gachala, Colombia.
Crystal system: monoclinic.
Unusual crystal habit, I think.
Can I hear from Pete? many thanks.
Roger.



Euclase-Gachala_R.jpg
 Description:
Euclase
Gachala, Colombia
9 mm
equant crystal
 Viewed:  45431 Time(s)

Euclase-Gachala_R.jpg


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Mark Ost




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PostPosted: Sep 15, 2013 20:59    Post subject: Re: Euclase, an equant crysal  

Roger. It is beautiful. Never seen anything like it.
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PostPosted: Sep 16, 2013 04:08    Post subject: Re: Euclase, an equant crysal  

Hi List,
Here is probably the best euclase in the world.
It was exhibited for the first time in Munich Expo in 2002.
Roger Titeux told me it originated from Gachala, Colombia.
What do you think about?
Roger.



Euclase2315b_R.jpg
 Description:
Euclase
Gachala, Colombia
> 15 cm - I think
 Viewed:  45269 Time(s)

Euclase2315b_R.jpg


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Pierre Joubert




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PostPosted: Sep 16, 2013 04:18    Post subject: Re: Euclase, an equant crysal  

Roger Warin wrote:
Hi List,
Here is probably the best euclase in the world.
It was exhibited for the first time in Munich Expo in 2002.
Roger Titeux told me it originated from Gachala, Colombia.
What do you think about?
Roger.


Wow Roger!!!!!! Is this mind blowing specimen your's or your name sake's? If indeed your's, well done.

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Jordi Fabre
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PostPosted: Sep 16, 2013 04:19    Post subject: Re: Euclase, an equant crysal  

Roger Warin wrote:
....What do you think about?

It exists another even better. Smaller, but unbroken.

Anyway, both are fabulous and yes, both came from Gachalá.
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Pete Richards
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PostPosted: Sep 16, 2013 15:04    Post subject: Re: Euclase, an equant crysal  

Roger Warin wrote:
Hi,
Here is a good example of equant crystal of euclase. Origin: Gachala, Colombia.
Crystal system: monoclinic.
Unusual crystal habit, I think.
Can I hear from Pete? many thanks.
Roger.


If you mean me, Roger, I protest that I am not an expert on the habit of euclase, but I would say this is an unusual habit in my limited experience. None of the drawings in Goldschmidt are very similar to this one; most are of the typical prismatic habit like the other one you posted later.

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PostPosted: Sep 16, 2013 15:17    Post subject: Re: Euclase, an equant crysal  

Another example


Euclase - Piaotang Mine_Dayu_Jiangxi_China.jpg
 Description:
Euclase
Piaotang Mine, Dayu, Jiangxi, China
Specimen size: 3.4 × 1.9 × 1.8 cm
Mined in 2007
Photo: Reference Specimens
 Viewed:  45238 Time(s)

Euclase - Piaotang Mine_Dayu_Jiangxi_China.jpg


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Mark Ost




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PostPosted: Sep 16, 2013 18:22    Post subject: Re: Euclase, an equant crysal  

OK Jordi....
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Martin Rich




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PostPosted: Sep 16, 2013 19:49    Post subject: Re: Euclase, an equant crysal  

In Alpine clefts, there occure sometimes Euclase with typical shape like in the first foto. I made a drawing similar to this fabolous blue crystal in the first foto.

Martin



Euklas 1.jpg
 Description:
Euclase
Euclase typical for Alpine clefts.
 Viewed:  45041 Time(s)

Euklas 1.jpg



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Fiebre Verde




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PostPosted: Sep 16, 2013 20:07    Post subject: Re: Euclase, an equant crysal  

Another exceptional specimen made the cover page of the Mineralogical Record not long ago


After_trimming.jpg
 Description:
Euclase
Gachala
unknown
 Viewed:  45033 Time(s)

After_trimming.jpg


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Fiebre Verde




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PostPosted: Sep 16, 2013 20:09    Post subject: Re: Euclase, an equant crysal  

The MinRec specimen before trimming... looks slightly different!


Before_trimming.jpg
 Description:
Euclase
Gachala
Unknown
 Viewed:  45004 Time(s)

Before_trimming.jpg


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Roger Warin




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PostPosted: Sep 17, 2013 01:41    Post subject: Re: Euclase, an equant crysal  

Hi Pete, Martin, and List,
Thank you for your opinions.
I never doubted the origin nor the identification of this euclase given by Roger Titeux, this extraordinary broker in mineralogy of high quality. He was a friend I regret the loss.
Thank Martin to show us a similar habit but still slightly different from my specimen.
Indeed, the blue of this stone is vivid, but blue is still poorly made by my camera that tends to make "electric" shades of blue. This camera is very sensitive in shades of blue-purple.
I use the Leica DFC 450 camera.
Roger.
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Martin Rich




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PostPosted: Sep 17, 2013 15:00    Post subject: Re: Euclase, an equant crysal  

Roger,
you are right, my drawing is only similar but I think this shape is not unusual. If you want to get sure, you have to make a goniometric measure.

Ok, I tryed it again but it is very hard from one single picture (sorry Roger, that I "killed" your wonderful photograph).

Martin



Euklas 2.jpg
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 Viewed:  44793 Time(s)

Euklas 2.jpg



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PostPosted: Sep 17, 2013 15:52    Post subject: Re: Euclase, an equant crysal  

Martin Rich wrote:
Roger,
you are right, my drawing is only similar but I think this shape is not unusual. If you want to get sure, you have to make a goniometric measure.

Ok, I tryed it again but it is very hard from one single picture (sorry Roger, that I "killed" your wonderful photograph).

Martin


Well done, Martin! I suspect the areas marked ? may be areas of abrasion.

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Martin Rich




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PostPosted: Sep 17, 2013 20:40    Post subject: Re: Euclase, an equant crysal  

Pete Richards wrote:


Well done, Martin! I suspect the areas marked ? may be areas of abrasion.


Thank you Pete!

I think also this areas are of abrasion. The image is not very clear, so I post only the drawing again.

Martin



Euklas 3.jpg
 Description:
 Viewed:  44731 Time(s)

Euklas 3.jpg



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Roger Warin




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PostPosted: Sep 18, 2013 03:35    Post subject: Re: Euclase, an equant crysal  

Hi Martin, Pete,
Thank you for this very interesting discussion.
Thank you for this beautiful drawing. Your best fitting is correct.
Here are three new pics.
I don’t think this is an abrasion that changes the face (?), but maybe it’s a stop of growth or a dissolution. Small crystal imperfections are aligned.
What do you think?
Roger.



Euclase-2b_R.jpg
 Description:
Euclase
Gachala, Colombia
another orientation
 Viewed:  44663 Time(s)

Euclase-2b_R.jpg



Euclase-2c2_R.jpg
 Description:
Euclase
other orientation
 Viewed:  44658 Time(s)

Euclase-2c2_R.jpg



Euclase-2c3_R.jpg
 Description:
Euclase
expansion of pic
 Viewed:  44642 Time(s)

Euclase-2c3_R.jpg



Euclase-4_R.jpg
 Description:
Euclase
60 X
 Viewed:  44634 Time(s)

Euclase-4_R.jpg


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Pete Richards
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PostPosted: Sep 18, 2013 07:37    Post subject: Re: Euclase, an equant crysal  

Roger Warin wrote:
Hi Martin, Pete,
I don’t think this is an abrasion that changes the face (?), but maybe it’s a stop of growth or a dissolution. Small crystal imperfections are aligned.
What do you think?
Roger.

Yes, on further thought, these "rounded" regions may be better explained by imperfections in growth or by dissolution. There are four equivalent regions on this crystal; your second image shows two of them. Are the other two also rounded? If the rounding were due to abarasion as e.g. by stream transport, one would think the steeper points at both ends would also be abraded, and that does not seem to be the case. In any event, the challenge is to understand why rounding is is confined to some parts of some edges and corners, and not seen on others.

Excellent images, Roger!

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Martin Rich




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PostPosted: Sep 18, 2013 21:45    Post subject: Re: Euclase, an equant crysal  

Roger, thank you for the excellent photographs, so I can see some more clear!

My last drawing (the red one) has some faults. {100} does not occur. I made new Miller indices for each face and I'm not sure if the shape {011} occures.

As supposed, this rounded shapes could be from dissolving. In my opinion there are two points according to a dissolving matter. 1st: not all edges and corners are affected. 2nd: Roger's last two photos are showing on the faces interesting cavities.

Martin



euclase_2b_r_981.jpg
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 Viewed:  44344 Time(s)

euclase_2b_r_981.jpg



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PostPosted: Sep 19, 2013 08:40    Post subject: Re: Euclase, an equant crysal  

Hi Martin,
Many thanks for this fine work.
Here are two pictures highlighting the faces {010} and {0-10}.
I think the face {100} is present. I'll try to photograph. It is very small.
Roger.



Euclase-Gachala-5_R.jpg
 Description:
Euclase
Gachala, Colombia
First side
 Viewed:  44305 Time(s)

Euclase-Gachala-5_R.jpg



Euclase-Gachala-6A2_R.jpg
 Description:
Euclase
Gachala, Colombia
The second side
 Viewed:  44346 Time(s)

Euclase-Gachala-6A2_R.jpg


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PostPosted: Sep 19, 2013 10:07    Post subject: Re: Euclase, an equant crysal  

Until Roger's last two images I was uncomfortable with my understanding of the morphology and orientation of this crystal, but now I think I understand it. Attached is a SHAPE drawing with a different interpretation of the morphology from that of Martin. Roger, can you compare these drawings with your crystal and see if they seem correct?

One hint about the orientation of the crystal is that striations typically run parallel to the c-axis of euclase, another is that euclase has perfect cleavage parallel to {010}. Perhaps there are some minor cracks that reveal the direction of the cleavage?



Euclase.jpg
 Description:
 Viewed:  44275 Time(s)

Euclase.jpg



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