Mindat Logo
bannerbannerbannerbanner
Welcome!

Fluorite, Germany

Posted by Rock Currier  
Re: Fluorite, Germany
February 03, 2012 08:26PM
Another nice specimen from the Black Forest: Grey-blue Fluorite from Hesselbach Mine. The mine was recently visited by collectors who found some really good blue and purple-blue Fluorites underground.



Fluorite Hesselbach, 8x5 cm© Dr. Holger Klapproth
avatar Re: Fluorite, Germany
February 04, 2012 06:04AM
Holger,
That's a decent specimen and as soon as the Tucson show is over and I can find the time, Ill put it into the article. Can you tell us something about the mine, geology, history, associated minerals, how many specimens were found?

Rock Currier
Crystals not pistols.
Re: Fluorite, Germany
February 04, 2012 12:02PM
Hi Rock,

enjoy Tucson - Germany is hit by a spell of Siberian cold and the ground is frozen rock hard. But that gives me a bit of time to do some literature work:

Hesselbach Mine:
Fluorite/Baryte vein at the border of Granite and Rotliegendes of about 1.5 m width. The vein is almost void of ore minerals except some iron minerals. Very good Fluorites with cube sizes up to 20 cms are known, colors were pink, blue/purple and green. Some Fuorite crystal were so clear that they could be used for optical purposes. There was some ancient mining in the area and on the vein. Modern mining reopened the mine around 1900 and operated the mine successfully till 1959 when low prices for Fluorite forced it to close again. While in operation the mine produced very good specimens of Fluorite and Baryte. For the Fluorite crystals combinations of octahedrons and codes were recorded. To find new mineral veins the miners in Hesselbach used dowsing even in modern times. Needless to say they did identify baryte veins in places where drilling/mining was not able to confirm their location. Minerals from Hesselbach were sold to famous dealers such as Dr. Krantz in Bonn and Maucher in Munich. Most specimens on the market nowadays come from later specimen mining at times when the mine was still accessible.
avatar Re: Fluorite, Germany
February 05, 2012 05:35AM
Holger,
Excellent, just the kind of information we need on all our localities.

Rock Currier
Crystals not pistols.
Re: Fluorite, Germany
February 05, 2012 01:34PM
    
Rock,

I don't know if this specimen is worthy but it is from the Frieberg District, Erzgeberge, Saxony, Germany. It came out of an old collection with that locality information. The fluorite is associated with white quartz and is 7cm by 8cm in size.

© Joseph Polityka

Best,

Joe Polityka
Re: Fluorite, Germany
February 05, 2012 03:53PM
Dear Rock, lovely article. Under the section for Zehntausend Ritter Mine, there are 2 identical photos of purple Fluorite by R. Lang - one says 4.5cm and the other says it's 6 cm. Thank you for all the work. Becky
avatar Re: Fluorite, Germany
February 05, 2012 04:30PM
Nice specimen, perhaps one of our German guys can put a better locality to the specimen.

Rock Currier
Crystals not pistols.
avatar Re: Fluorite, Germany
February 05, 2012 04:31PM
Becky,
After Tucson, Ill look into this and try and find out which is which.

Rock Currier
Crystals not pistols.
Re: Fluorite, Germany
February 05, 2012 07:02PM
    
Joseph, this looks like a specimen from the Segen Gottes Mine, Gersdorf, Freiberg District.
A fine example from this locality.
Re: Fluorite, Germany
February 05, 2012 09:11PM
    
Really hard to determine exactly from which Saxonian mining field this specimen came. Freiberg is possible. Such yellow crystalls came also from Gersdorf. The fluorites of the Annaberg district (10000 Ritter) have mostly a darker colour. However I found similar fluorites also with quartz crystalls on the dump 139 in Lauta/Marienberg.

If you are not sure then make a picture of the back side but I think Freiberg may be true.

Uwe Ludwig
Re: Fluorite, Germany
February 05, 2012 11:35PM
    
Thanks, Leon and Uwe,

The rear of the specimen has a $1.50 price tag next to the number 4305. It might have been a Foote specimen.

The matrix seems to be massive quartz with disseminated micro sulphides with interspersed fragments of bladed barite in some areas. There is a 1cm layer of light brown limestone attached to the back of the specimen.

Thank you and best wishes,

Joe
Re: Fluorite, Germany
February 06, 2012 06:34PM
    
The matrix confirms the Freiberg district compared with the other Saxonian localities.

Uwe Ludwig
Re: Fluorite, Germany
February 06, 2012 09:41PM
[www.mindat.org]
This one or one of the child photos.
Why?

As far as I can see, it shows crystals with the very rare crystallographic form {731} , resulting in a scalenohedral shape, as described by
E. Preuss, H. Ziehr
Skalenoedrische Flußspatkristalle mit der Form (731) von der Grube Cäcilia/Nabburg. Zeitschrift für Kristallographie, 146, S. 131ff, 1977

See also Berthold Weber's Mineralienseite: [www.berthold-weber.de]
for an explanation in German, specifically:
[www.berthold-weber.de]

The crystal drawings and photos speak for themselves.

The specimen on the Mindat photo is actually from the Preuss collection.
Unfortunately the only specimen on Mindat that shows this habit.



Edited 1 time(s). Last edit at 02/06/2012 09:42PM by Amir C. Akhavan.
Re: Fluorite, Germany
February 06, 2012 10:44PM
Hi Joe,

I have a similar specimen in my collection with a label that states "Halsbrücke" (that is in the Freiberg mining diststrict). Unfortunately the mine is not stated.


Best Regards

Holger
Re: Fluorite, Germany
February 08, 2012 06:36PM
The mining area near Todtnau (Black Forest)


As the mines and ore veins of this formerly very important mining area (silver in the middle ages and fluorite in modern times) are not well described in mindat I will try to add some data here. Even the standard literature is of not much help as it does not well represent the old mining and some information my have been lost over the centuries - Todtnau had at least two major fires that reduced the mining city to a village. Mining in Todtnau is old - the oldest known citation of Todtnau as "Totenuova" is from 1025. Mining is recorded from 13th century as the taxes have been payed to the monastery St. Blasien (1247). The settlement was raised to city status in 1283. At the beginning of 14th century there were around 300 working miners reported. The location of most of the old mines is not known, at least not by name. With the exception of the mine "Zur Schindelhalde" near Aftersteg. The big earthquake of Basel in 1356, which destroyed much of Basel also did great damage to the mining area in Todtnau, but it seems that mining industry recovered very quickly. The most important old mine in the area was the "Grube zum Gauch", with had a big waterwheel. Like in most other Black Forest mining areas mining did not do well in 16th century and ceased due to exhausted ore reserves and the 30 years war in 17th century. There was little mining in 18th or 19th century and only elevated interest in Fluorite lead to renaissance of the mining area in early 20th century. The second half of the 20th century was not a good one for the mines as Fluorite prices were falling and mining was becoming more expensive. The last mine in that area was closed in 1974. Mining there was always a bit difficult as the mines were in a region and often snow forced the mining activities to rest over winter.

Important mines were

Grube "zum Gauch" (Todtnauberg, 14th century)

Grube Maus

Grube St. Anna (Grube Fahl)

Tholusbrunnen (Silberberg)

Grube Baumhalde (Silberberg)

Kernerloch (Silberberg)

Grube Brandenberg: most fluorite specimens from the area are from this mine

Grube Rotenbach

Grube Liesbühl


The most common minerals from this mining area are Fluorite, Calcite,Pyromorphite, Galenite, Chalcopyrite and Baryte.



Edited 1 time(s). Last edit at 02/09/2012 08:44AM by Holger Klapproth.
Re: Fluorite, Germany
February 08, 2012 11:45PM
    
Holger,

Thank you for the information. Your outline of the local history is very interesting. Do you have a photo of your fluorite?

Best,

Joe
Re: Fluorite, Germany
February 09, 2012 08:48AM
Joe,

I will make a picture of that specimen an post it in the next days and post it here.

Best Regards


Holger
Re: Fluorite, Germany
February 10, 2012 04:28PM
Hi Joe,


here is the picture, difficult to photograph.


Best Regards


Holger


Fluorite Halsbrücke, 7x6 cm© Dr. Holger Klapproth
Re: Fluorite, Germany
February 16, 2012 07:58PM
More Fluorites from Black Forest


This time a rather rare locality: Grube Anton / Wieden. There is a lot of Tannenboden Mine stuff on the market but very little good material from Anton. This one I bought a few years ago from a local mineral dealer who specialices in buying old collection and selling the better pieces on mineral shows. I now live in Black Forest since 1997, but this is the first good specimen from that mine I was able to get my hands on. The coating with pyrite is a bit unusual for Wieden, but could be confirmed by comparison with similar specimens. A pity these mines are closed now. Imagine all the wonderful specimens that came out there in the 1950s and 60s.

Fluorite, Anton Mine, Wieden, 10x9 cm© Dr. Holger Klapproth
Re: Fluorite, Germany
February 16, 2012 11:32PM
    
Holger,

Very nice specimens. The yellow fluorite looks very similar to the one in my collection.

Thank you,

Joe
Author:

Your Email:


Subject:


Attachments:
  • Valid attachments: jpg, gif, png, pdf
  • No file can be larger than 1000 KB
  • 3 more file(s) can be attached to this message

Spam prevention:
Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.
CAPTCHA
Message:
Mineral and/or Locality  
Search Google  
Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: August 29, 2014 05:19:42
Mineral and Locality Search
Mineral:
and/or Locality:
Options
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds