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Fluorite, Germany

Posted by Rock Currier  
Re: Fluorite, Germany
September 28, 2011 05:34PM
Fluorite Location:

Artenberg Quarry, Steinach, Black Forest

Quartz-Calcite veins in gneiss rock. This was the best location for large fluorite octahedrons in the whole black forest. Green crystals of up to 10 cm have been found there, sitting on white calcite and looking very very attractive. Smaller crystals in blue and grey were also found, but green was the predominant color. These fluorites also have another nice feature - they fluoresce quite well. Most other black forest fluorites exhibit a rather dull fluorescence. Also a lot of the crystals have a rather "etched" looking surface composed of little fluorite cubes. Other associated minerals were quartz, pyrite, chalcopyrite and other sulfides. Though the quarry is still active there has been no fluorite find for quite some time as the part of the quarry with the fluorite mineralization is currently not in use. When the fluorites were found some local collectors used to claim the best spots and tried to keep other people away - even by threat of violence. Good calcite crystals and some of the associated ore mineralization can still be found. Permission of access is required. Since the "Naturkundemuseum Freiburg" was changed to the "Naturmuseum" and the mineral collection display there was sacrificed almost completely (shame on them) the only place I know to display Artenberg Fluorites is the Minerlienmuseum in Wolfach, near the famous Clara mine.
avatar Re: Fluorite, Germany
September 28, 2011 06:16PM
Holger,
Thanks very much for your good write up on the Artenberg Quarry. I have included that locality now in the Best Minerals-Germany article and given yu credit for them. This is an example of our image gallery being almost entirely empty of good pictures of fluorite specimens from this locality and that was undoubtedly why it was not included in the first place. I have put in one picture of a fluorite from there, but it is pretty ratty compared to some of the specimens you describe. If you could take a picture of a few decent ones from this quarry and post them to the mindat gallery I would be more than pleased to include them in the article.

If you can further direct me to other deficiencies in the article and do write ups about some of the other fluorite localities I would be glad to include your comments on them.

Rock Currier
Crystals not pistols.
Re: Fluorite, Germany
September 29, 2011 04:19PM
Rock,

it is my pleasure, here are the pictures of the two Artenberg specimens I have here in Freiburg. The lighter green color is a bit difficult to catch.

Fluorite Artenberg, 12x8 cm© Dr. Holger Klapproth


Fluorite Artenberg, 10x8 cm© Dr. Holger Klapproth
Re: Fluorite, Germany
September 30, 2011 11:27AM
More Fluorite fun !

Teufelsgrund Mine, Münstertal, Schwarzwald

Teufelsgrund ("Devils Ground" ) is an abandoned Silver/Fluorite Mine in the southern Black Forest. The mine exploited several mineralized veins, with Schindler vein and Teufelsgrund vein maybe being the most important ones. The oldest record of mining on these veins is from 1512 ! - but carbon dating of a peace of charcoal fould in one of the workings reveled that mining started a lot earlier - the piece was dated to around the year 950. The mine closed in 1958 due to low Fluorite prices. It was reopened as a visitors mine some years ago and is well worth visiting. The Fluorites from this mine are really amazing. Starting with cubes and extra faces on the edges the crystals "transform" to rhombic dodecahedrons, hexakis octahedrons to almost spherical structures with 282 faces (see Extra Lapis 4, Fluorite p. 72ff.). Whereas cubic crystals could reach the size of 5 cm and more the more complex crystals are rather small (mms) but make out he special magic of these pieces. Especially water clear hexakis octahedrons growing on marcasite are very famous and can be found in several museum collections. Though these crystals are tiny they can still be found on the old dumps - and is worth digging for them. The larger crystals are quite often pinkish to purple but other colors were also reported. The smaller, water clear crystals mostly have no color at all.
After its closure the mine was the used by mineral collectors to collect very beautiful specimens. This even included the use of explosives - and a really nasty accident happened. Now this is the story how I was told it: Two guys had themselves locked in underground and put some charges in place. As they did not explode as expected one of these guys went to have a look and got hit by the blast. He barely survived and was seriously wounded. Now as they were locked in the only way out was use the rest of the explosives to blast the entrance door open. They made it and the wounded person survived though he lost some fingers and had his eyes damaged. As dealing with explosives and damaging other peoples property is a serious offense these guys also faced criminal charges - but the court showed mercy and the verdict was rather mild.

Now we need some good close-ups of hexakis octahedrons and such like. I hope I can get some good ones in the near future.




Fluorite Münstertal, 9x5 cm© Dr. Holger Klapproth
avatar Re: Fluorite, Germany
October 03, 2011 02:52AM
Holger,
OK, thanks, Iv'e got your first two images in the article. I sure wish one or more of you guys would step up and take this job in hand. As an American trying to do an article on German Fluorites I feel like a fish out of water. Ill keep hacking away at it, but it would be much better if someone who really knows something about German Fluorites would take the lead in this.

Rock Currier
Crystals not pistols.



Edited 2 time(s). Last edit at 10/03/2011 03:42AM by Rock Currier.
avatar Re: Fluorite, Germany
October 03, 2011 03:55AM
Holger,
That is a really good write up on the Teufelsgrund Mine. I have added your image and the text almost exactly as you gave it. Keep the good stuff coming. Perhaps this article will not look so bad after all.

Rock Currier
Crystals not pistols.
avatar Re: Fluorite, Germany
October 03, 2011 07:24AM
    
Super!, Danke Holger, für deine Hilfe.
Re: Fluorite, Germany
October 10, 2011 09:23AM
Hi all,

I will add more stories and pictures by the end of the month. In the next two weeks It is a bit difficult for me to add more data. But there is "Tannenboden Mine" where big Fluorites were recovered in post mining activities and last not least "Anton / Wieden" a mine connected to Tannenboden.

I am also waiting for some local collector friends to add some pictures of the complex crystals from "Teufelsgrund". These are small but really amazing.

Glück auf


Holger
avatar Re: Fluorite, Germany
October 10, 2011 11:38AM
Holger,
Ill look forward to getting the pictures.

Rock Currier
Crystals not pistols.
Re: Fluorite, Germany
October 23, 2011 05:00PM
More about German Fluorites....


Tannenboden Mine, Wieden, Black Forest

Tannenboden Mine used to be one of the most visited mines for fluorite collecting after the commercial operations closed down in the 70s.The mine is not very old, mining on the Tannenboden vein started in 1937 but only when the Baryte and Fluorite deposits in near Grube Anton were almost exhausted Tannenboden Mine was properly worked. The mine was productive in the times from 1949 to 1974. The mine produced silver, lead and zinc minerals, too but is most famous for its big green Fluorites. After its closure local mineral collectors opened the gate to the main adit and entered the mine for specimen hunting, Very good fluorites were obtained during that time. When I came to Freiburg in 1997 local mineral collectors took me to a trip to the mine through a different entry - the foxhole. A little digging to reach the top level of the mine through a muddy and wet entrance. Going down to the adit meant climbing down wooden ladders which were dripping wet with mine water (to keep the wood fresh). I was cold and wet at the time I reached that level and did not really find that much (a few nice fluorites...). But being new to underground collecting I had the wrong equipment and the wrong expectations. A few weeks later I was asked why the hell I did not enter through the main door... . That was indeed a lot easier. It all ended when one stupid bloke found a huge and ugly Fluorite aggregate underground and used a saw to cut some bars from that door away to get the specimen out. Then it was too obvious and the mine entrance got secured properly. And the "foxhole" got closed, too. Now is is almost impossible to get access to the mine - even for scientific reasons due to "insurance issues" and such stuff. So instead of getting cold wet and dirty on a friday night looking through the leftovers of 30 years of underground collecting I just bought some nice Fluorite specimens. Fluorites in a light green color with several cm edge length were quite common. Larger crystals would be less clear and most often badly etched and / or covered with iron oxides etc. Crystals with more than 20 cm edge length were recovered though I must say that the really big ones were too ugly to even go into the garden.
Re: Fluorite, Germany
November 02, 2011 07:07PM
As promised - more pictures of Fluorites of the Black Forest. This one is a really nice big crystal from Tannenboden Mine - with the typical coverage of Baryte.


Fluorite Tannenboden, 11x9 cm© Dr. Holger Klapproth
Re: Fluorite, Germany
November 02, 2011 09:15PM
    
Hello Rock Currier,

the location of the first picture of the fluorites of Saxony is so not correct. Euba is a village at the suburbs of Chemnitz and belongs not to Frankenberg. The label should be Saxony, Euba, Wachtelberg.

Uwe Ludwig
Re: Fluorite, Germany
November 02, 2011 09:21PM
    
I can add pictures of fluorite specimens of Schneeberg, Zobes, Zschopau (all Saxony) which locations are not yet part of the gallery.

However, how to load the pictures? A short advise would be wellcome.

Uwe Ludwig
Re: Fluorite, Germany
November 02, 2011 09:47PM
Hallo Uwe,

this is rather simple:

you need to add the following information:

*pic id=421896 width=700 float=centre* Fluorite Tannenboden, 11x9 cm[/pic]

and you must change the exchange the two * with [ and ]. If the[ ] are in I cannot show the text but the picture would be displayed instead.

Then the number must be changed to the number of your picture and the description must be adapted.... the width can be changed also if you want to add a large or smaller pic.


I hope that helps


Glück auf


Holger
Re: Fluorite, Germany
November 03, 2011 12:01PM
    
Thanks Holger for your information.

However, either I am too dopy or I did not understand what you wrote. I was not successfull to add my pictures this way.

Anyway, there are enough nice fluorites. No need to add my pictures, too.

Uwe Ludwig
avatar Re: Fluorite, Germany
November 04, 2011 07:20AM
Uwe,
Click on this link: How to upload mineral pictures to Mindat.
As you upload them, come back to this forum and give me the image number or a link to the images so I can look them over. Ill look forward to your pictures.

If you want to know how to place images in these fields providing the images are already in the mindat database read over this link.


Rock

Rock Currier
Crystals not pistols.



Edited 1 time(s). Last edit at 11/04/2011 07:25AM by Rock Currier.
Re: Fluorite, Germany
November 04, 2011 11:49AM
    
Thank you Rock, it happend!

Further pictures will follow up.

Uwe Ludwig
Re: Fluorite, Germany
January 22, 2012 02:29PM
More Fluorites....


one more Fluorite to start for the New Year. Blue Fluorite from the Black Forest Location Fahl (Todtnau). This is a specimen from an old collection where the label is not helpful - just stating Fahl. Most likely this is from St. Anna mine but the information on the mines and veins there is not very good. Still a very beautiful specimen that has a lovely blue color. As these specimens may loose their color if subjected to sunlight I rather keep it in a dark drawer.


Fluorite Todtnau-Fahl, 4x3 cm© Dr. Holger Klapproth




Edited 1 time(s). Last edit at 01/22/2012 02:34PM by Holger Klapproth.
Re: Fluorite, Germany
January 22, 2012 09:29PM
one more little thing for tonight


A really nice yellow Fluorite from Leopold Adit in Münstertal. The mine was reopened in 1957 to prospect for Fluorite. Other workings of that mine date back to the middle ages and were at least partially produced by fire setting. Fluorite crystals with an edge length of more than 40 cm were reported, but these crystals are etched on their faces and may not look very nice at all.



Fluorite Leopold adit, Münstertal 14x6 cm© Dr. Holger Klapproth




Edited 1 time(s). Last edit at 01/22/2012 09:46PM by Holger Klapproth.
Re: Fluorite, Germany
January 22, 2012 10:04PM
as my girlfriend is still busy preparing for her seminar tomorrow... one more thing


Fluorite from Riesenwald Quarry (or maybe the mine next to the quarry), Hinterohlsbach, near Gengenbach - in the central Black Forest. This was one of the first locations I ever visited as a very young man. And did not find much. When I went there 20 years or so later with some local collectors they dug there a lot and found some strangely etched Fluorites. I was not to keen collecting these and just removed some rocks when they were finished and found a nice little vug full of purple cubes. Enough to make my day. Then the locals told me that there is a mine next to the (disused) quarry from there the better fluorites came. They even showed me the the entrance and how to open the gate that locks it. But we had no hard hats and lamps with us so we went home with our lucky findings. The specimen here is from an old Fluorite collection that was sold some years ago. It is described as a "Clara Mine" specimen in the Extra Lapis Fluorite. But the hydromuscovite matrix and the crystals clearly prove that this is from "Ohlsbach". To be sure I also checked this with the author of that article who happens to live just a few hundred meters down the road.


Fluorite Ohlsbach, 8x5 cm© Dr. Holger Klapproth




Edited 1 time(s). Last edit at 01/22/2012 10:06PM by Holger Klapproth.
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