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05 Jun-06:52:32 Re: collection of sante celiberti - a mineralogical trip through italy (Tobi)
05 Jun-06:43:00 Re: any interesting minerals from ukraine? (Peter Lemkin)
05 Jun-06:40:34 Re: from where is this sulphur?. Could it be from italy? (Tobi)
05 Jun-03:08:20 Re: from where is this sulphur?. Could it be from italy? (David)
05 Jun-03:00:29 From where is this sulphur?. Could it be from italy? (David)
05 Jun-02:51:24 Re: any interesting minerals from ukraine? (David)
04 Jun-17:36:55 Re: stay at home - coronavirus / covid-19 (Fena Kuiperi)
04 Jun-15:53:19 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
04 Jun-13:15:12 Stay at home - coronavirus / covid-19 - magic castle (Jordi Fabre)
04 Jun-10:23:50 Re: collection of annemieke en rob schnerr (Rob Schnerr)
04 Jun-09:05:12 Re: collection of firmo espinar (Firmo Espinar)
04 Jun-08:42:41 Re: collection of volkmar stingl (Volkmar Stingl)
04 Jun-07:04:54 Re: any interesting minerals from ukraine? (Riccardo Modanesi)
03 Jun-15:36:00 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
03 Jun-13:10:03 Re: stay at home - coronavirus / covid-19 (Enrique Llorens)
02 Jun-18:27:15 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
02 Jun-12:40:16 Stay at home - coronavirus / covid-19 - hibiscus (Jordi Fabre)
02 Jun-03:16:14 Re: any interesting minerals from ukraine? (David)
02 Jun-02:04:21 Re: any interesting minerals from ukraine? (Riccardo Modanesi)
02 Jun-01:50:10 Re: any interesting minerals from ukraine? (David)
01 Jun-22:24:16 Re: any interesting minerals from ukraine? (Peter Lemkin)
01 Jun-17:47:51 Re: any interesting minerals from ukraine? (Robert Seitz)
01 Jun-11:16:03 Re: collection of firmo espinar (Firmo Espinar)
01 Jun-06:27:15 Re: any interesting minerals from ukraine? (David)
01 Jun-06:03:02 Re: any interesting minerals from ukraine? (David)

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Collection of Tobi
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Tobi




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PostPosted: Mar 31, 2010 03:43    Post subject: Re: Collection of Tobias Martin  

James, thank you. I'm glad you like it.

Andreas, thanks also. You know much more than i about little-known German localities, so i must confess that i don't know how these opaque scalenohedrons look ...
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PostPosted: Apr 05, 2010 07:58    Post subject: Re: Collection of Tobias Martin  

Here's the "smaller brother" of the sceptered amethyst from Brandberg/Namibia, that i posted some days ago. This tiny one measures 40 x 35 x 20 mm.


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Tobi




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PostPosted: Apr 10, 2010 03:31    Post subject: Re: Collection of Tobias Martin  

Inspired by the wonderful quartz pictures of José Miguel, here's a picture of a specimen from Jinkouhe/Sichuan/China, using back light. The three main crystals have lenghts of 70-80 mm.


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Carles Millan
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PostPosted: Apr 10, 2010 05:42    Post subject: Re: Collection of Tobias Martin  

Tobias Martin wrote:
Inspired by the wonderful quartz pictures of José Miguel, here's a picture of a specimen from Jinkouhe/Hunan/China, using back light.

Good photo and nice specimen architecture!
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Tobi




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PostPosted: May 06, 2010 11:10    Post subject: Re: Collection of Tobias Martin  

Another specimen from China: Water-clear crystals of quartz on hematite, from Jinlong/Guangdong Province. The longest crystals have a lenght of 70 mm, overall size of the specimen is 100 x 90 x 55 mm.


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PostPosted: May 06, 2010 14:22    Post subject: Re: Collection of Tobias Martin  

Tobias Martin wrote:
Another specimen from China: Water-clear crystals of quartz on hematite, from Jinlong/Guangdong Province.

A fine and aesthetic specimen from Jinlong, better than mine.

BYW, Tobias, the locality full name, according to Mindat, is Jinlong hill, Longchuan, Heyuan, Guangdong, China.

Congratulations!
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Tobi




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PostPosted: May 06, 2010 16:27    Post subject: Re: Collection of Tobias Martin  

I'm glad you like it, Carles, i really appreciate your opinion very much!

But you can't say that this one is "better" than yours ( https://www.mineral-forum.com/message-board/files/8570m_quartz_173.jpg ), for i don't think they are that easy to compare. My new specimen may be a good sample for water-clear quartz from Jinlong Hill without any coating, while your specimen is a very good example for the typical hematite-coated crystals from that locality. I would say: Two good examples for two different forms of quartz appearance from Jinlong Hill.
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José Miguel




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PostPosted: May 12, 2010 02:46    Post subject: Re: Collection of Tobias Martin  

Hi Tobias. The quartz from Jinkouhe/Hunan/China looks very well, with its slender and clear crystals!!
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Tobi




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PostPosted: May 12, 2010 04:15    Post subject: Re: Collection of Tobias Martin  

Hi José, i'm glad you like the quartz specimen. I will try to make some further pictures from other angles in the next days. But first, a correction: I made a mistake in the locality description of the specimen and you copied it unwittingly - Jinkouhe is not located in Hunan province, but in Sichuan province! Sorry for the mistake, maybe one of the admins can correct it.

Cheers!
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PostPosted: May 12, 2010 05:03    Post subject: Re: Collection of Tobias Martin  

Tobias Martin wrote:
Jinkouhe is not located in Hunan province, but in Sichuan province! Sorry for the mistake, maybe one of the admins can correct it.

Corrected.

According to Mindat, the locality's full name is Jinkouhe, Ebian Co., Leshan Prefecture, Sichuan Province, China.
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Luiz Menezes




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PostPosted: May 12, 2010 16:30    Post subject: Re: Collection of Tobias Martin  

Hi Tobias:

The cluster of clear quartz crystals is a great one, very aesthetic.

Luiz
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PostPosted: May 13, 2010 09:01    Post subject: Re: Collection of Tobias Martin  

If so many of you like that specimen*, here - as promised - some more shots of it.
________
* Quartz cluster from Jinkouhe, Ebian Co., Leshan Prefecture, Sichuan Province, China. Height 90 mm.



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Carles Millan
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PostPosted: May 13, 2010 09:22    Post subject: Re: Collection of Tobias Martin  

Tobias Martin wrote:
If so many of you like that specimen*, here - as promised - some more shots of it.

These photos are much better than the previous one, above. It's not easy at all to photograph transparent colorless quartz crystals. I'm not able to do so yet. Congratulations!
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Pete Richards
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PostPosted: May 13, 2010 09:30    Post subject: Re: Collection of Tobias Martin  

Tobias Martin wrote:
A calcite from a locality most of you will not know: Alme, near Brilon, Sauerland, North Rhine-Westphalia, Germany. This specimen is neither spectacular nor very aesthetic, but the crystal form is quite interesting. I've seen such a form never before on a calcite specimen, and it rather reminds me of some topaz crystals i've seen. Size 45 x 30 x 30 mm.


Tobias,

Here's a reasonable guess about the forms involved in your Alme calcite. You can tell me whether the habit I've drawn is too steep or not....



Calcite.jpg
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Drawings of an interpretation of the Alme calcite habit. Top, standard crystallographic orientation. Bottom, view corresponding to Tobias' photos.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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PostPosted: May 13, 2010 10:47    Post subject: Re: Collection of Tobias Martin  

Pete, thanks for your interest and effort. The only problem concerning a further investigation of the specimen: It was recently acquired by Andreas Gerstenberg from Berlin (for he is more interested in rare German localities than i), so the photo i posted in this thread is the only thing that i have left of that calcite. But Andreas is also a member of FMF, so maybe he reads this or you can contact him via this forum.

Carles, thanks for commenting my photos. Indeed it is very tricky to take photos of such clear crystals - except for José Miguel, who does it as if it was the easiest thing to do :-) But according to your own photographing skills i don't think you're unable to do so. You usually make really good mineral photos, so you won't fail with such specimens if you try it out.

Here are some additional photos of the other clear Chinese quartz specimen that was already posted above (Quartz on hematite, Jinlong hill, Longchuan, Heyuan, Guangdong, China. 100 x 90 x 55 mm).



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PostPosted: May 13, 2010 15:58    Post subject: Re: Collection of Tobias Martin  

Tobias Martin wrote:
Carles, thanks for commenting my photos. Indeed it is very tricky to take photos of such clear crystals - except for José Miguel...

You're right, Tobias, very very tricky!
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PostPosted: May 14, 2010 14:30    Post subject: Re: Collection of Tobias Martin  

Taking photos of minerals is tricky in general, not only when handling clear crystals. But the latter can really be frustrating ;-)

Here's another specimen from my collection: Garnet var. Hessonite from Kunar Valley, Nuristan, Afghanistan. Overall size 120 x 90 x 50 mm, the largest crystals are slightly smaller than 20 mm.



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PostPosted: May 15, 2010 02:39    Post subject: Re: Collection of Tobias Martin  

Tobias, very nice again the second pic of the cluster of Jinkouhe.
To take photos to the transparency is... not only tricky, it is impossible!
We take a photo to the background, not to the crystal. The crystal appears because of the obstacles, because of the opacity of the crystal. It neccessary to choose very well this background and these obstacles, and, of course, the light!.
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PostPosted: Jun 07, 2010 07:29    Post subject: Re: Collection of Tobias Martin  

This specimen is from a classic German locality which is famous to all calcite collectors: Holzen quarry near Arnsberg, Sauerland, North Rhine-Westphalia, Germany. The specimen features several water-clear calcite crystals up to 25 mm on a large rock coated by dolomite. A vug on the specimen features the largest calcite crystal which is grown as an interesting kind of twin i've not seen before. The specimen measures 170 x 130 x 100 mm.


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A closer shot of the vug with the calcite twin inside.
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PostPosted: Jun 07, 2010 07:31    Post subject: Re: Collection of Tobias Martin  

Some closer photos of the clear calcite crystals on dolomite (largest calcites have a size of 15 mm).


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