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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4112
Location: Germany
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Posted: Jan 16, 2014 11:41 Post subject: A mineralogical trip through Germany / Rest of Germany |
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The regions of Germany that do not have their own thread are located in the north and northeast of the country. Those coastal areas have no importance for mining or mineral collecting because their geologic formation shows only a few small mineral deposits worth mentioning. There are some exceptions, e.g. the chrysocolla finds of Helgoland Island in the North Sea, but they are so few that they all can be summarized in one thread.
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Chrysocolla Helgoland Island (North Sea), Schleswig-Holstein, Germany fov 6 mm Collection and photo: Andreas Gerstenberg |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Jan 17, 2014 06:10 Post subject: Re: A mineralogical trip through Germany / Rest of Germany |
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There are more minerals from Helgoland that should be mentioned, f.e. excellent cuprite xls in vugs up to 6 cm, the best German connelites forming deep blue veins of needles in the sandstone matrix.
In Brandenburg, in the mid-northeastern part of Germany the celestine occurence in the Rüdersdorf limestone quarries is remarkable as well as the Bad Freienwalde gypsums (but more of a regional importance).
In Schleswig-Holstein there is an outcrop of Permian copper shist near Hamburg: the Lieth clay pits and limestone quarry. Good fluorite crystals up to 5 cm were found here.
Further more the northern areas of Germany are known for amber. Large specimens up to 20 cm and more are known not only from the coastal areas but also from Berlin.
In the following i will show some specimens from the "rest of Germany":
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Pyrite Parey sand pit, Spandau, Berlin, Germany 10 x 7 cm Found in 1967. |
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Amber Thorwaldsenstraße, Steglitz, Berlin, Germany 5,2 x 2,6 cm Found in the late 1970s during the construction of a house. |
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Celestine Alvensleben quarry, Rüdersdorf, Brandenburg, Germany Largest crystal: 2 cm |
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Gypsum Finsterwalde, Lower Lusatia, Brandenburg, Germany 13,5 x 4,5 cm |
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Gypsum Hammerthal clay pit, Bad Freienwalde, Brandenburg, Germany 7 x 4,5 cm |
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Gypsum Hammerthal clay pit, Bad Freienwalde, Brandenburg, Germany 8 x 5 cm |
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Gypsum Hammerthal clay pit, Bad Freienwalde, Brandenburg, Germany 10 x 5,5 cm |
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Phosphorite Friedland clay pit, Neubrandenburg, Mecklenburg-West Pomerania, Germany 8 x 8 cm |
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Fluorite Lieth quarry, Elmshorn, Schleswig-Holstein, Germany Picture width: 9 cm |
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Fluorite Lieth quarry, Elmshorn, Schleswig-Holstein, Germany 1,2 cm crystal |
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Halite Fiscal salt drill, Lieth, Elmshorn, Schleswig-Holstein, Germany 8 x 6 cm Found about 1870. |
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bugrock
Joined: 24 Nov 2008
Posts: 137
Location: Michigan
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Posted: Jan 17, 2014 20:55 Post subject: Re: A mineralogical trip through Germany / Rest of Germany |
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Hello Andreas,
Very interesting selection of minerals in these posts.
The color of the celestine seems unusual. Are the reddish shades in the crystals?
Are there inclusions?
Please continue posting.
George
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Jan 19, 2014 10:12 Post subject: Re: A mineralogical trip through Germany / Rest of Germany |
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Hi,
The reddish colour is due to micro inclusions of hematite. Most people associate Rüdersdorf with blue celestine crystals. In fact the blue crystals are much more infrequent than red ones. However, there were found also colourless and yellow crystals at Rüdersdorf. The shown one i collected myself in 2013.
Attached two more Rüdersdorf specimens, both self-collected too.
Best regards
Andreas
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Celestine Alvensleben quarry, Rüdersdorf, Brandenburg, Germany 9 x 5 cm Such a deep blue colour is very rare at Rüdersdorf. |
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Celestine Alvensleben quarry, Rüdersdorf, Brandenburg, Germany Largest crystal: 3 cm |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Jan 28, 2014 06:51 Post subject: Re: A mineralogical trip through Germany / Rest of Germany |
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Two more specimens from Mecklenburg.
Even in Germany Mecklenburg-West Pomerania is not a Land that one would connect with minerals or mining. However, about 1910 there was a small salt mining district near Ludwigslust with salt shafts in Conow and Lübtheen. Today the shafts are gone, hardly discernible dumps are the only relics left. Minerals are extremely rare, known are anhydrite crystals, halite, sylvite and - allegedly - boracite. The picture shows pseudo-octahedral anhydrite crystals in glass vial from the Conow shaft.
The other picture shows a very odd specimen too. Azurite spheres with malachite sitting in a matrix that seems to be peat. I wasn´t able yet to find any literature dealing with that occurence and am not quite sure whether it´s a natural formation or not...
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Azurite, malachite Ueckermünde, Mecklenburg-West Pomerania, Germany 11 x 8 cm |
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Anhydrite Conow shaft, Ludwigslust, Mecklenburg-West Pomerania, Germany 4 - 6 mm crystals |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Aug 19, 2014 08:35 Post subject: Re: A mineralogical trip through Germany / Rest of Germany |
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The area around Berlin is, as mentioned before, known as kind of a "mineral-free zone" (except Rüdersdorf, of course). Now i had the chance to get another specimen from here: an exceptionally large gypsum aggregate from an old coal mining district near Berlin. The coal occured in small veins in a clay and was mined until around 1915. There is scarse literature mentioning small gypsum crystals so i was surprised to see such a giant.
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Gypsum Rauen hills, Petersdorf, Fürstenwalde, Brandenburg, Germany 15 x 13 cm |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Apr 26, 2016 10:48 Post subject: Re: A mineralogical trip through Germany / Rest of Germany |
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A rare and very old amber from Rüdersdorf:
Mineral: | Amber |
Locality: | Limestone quarries, Stienitzsee Lake, Rüdersdorf, Märkisch-Oderland, Brandenburg, Germany | |
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Dimensions: | 4,5 x 4 cm |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 26, 2018 11:15 Post subject: Re: A mineralogical trip through Germany / Rest of Germany |
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An amber from Berlin:
Mineral: | Amber |
Locality: | Postfenn Pit, Grunewald, Berlin, Germany | |
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Dimensions: | 4 x 3,5 cm |
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