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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:40 Post subject: Re: Andreas Gerstenberg Collection |
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An almost forgotten variety of dolomite is "tharandite" in brown translucent rhombic crystals, quite unusual for this mineral. Sometimes you see "normal" dolomite, typically saddle-shaped crystals falsely labeled as "tharandite". These specimens occur from the newer lime quarries at Tharandt near Dresden, Saxony. The shown sample is an original "tharandite" from its type locality, the Schweinsdorf lime quarry near Döhlen.
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54222 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:41 Post subject: Re: Andreas Gerstenberg Collection |
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With label (dating from 1897) written by August Frenzel.
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54099 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:41 Post subject: Re: Andreas Gerstenberg Collection |
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Little azurite sphaerolites on thin copper shist layer on sandstone from the Cornberg quarry near Richelsdorf, Hesse. About 6 cm wide sample with original label from the Dr Balzer collection/Berlin, dated from 1919.
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54088 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:42 Post subject: Re: Andreas Gerstenberg Collection |
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Hair salt as a 9,5 cm sample from the Hattorf potash mine, Phillipsthal, Rhön mountains, Hesse.
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54069 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:43 Post subject: Re: Andreas Gerstenberg Collection |
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Three elbaite micros (the two upper ones with lepidolite) from Wolkenburg, Saxony. The tourmalines from this famous classic locality ranged from black, blue, green to red and even white. Furthermore crystals occured, green on the one and red on the other end of the crystal. The little crystal in front measures about 1 cm in length.
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54103 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:44 Post subject: Re: Andreas Gerstenberg Collection |
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Red "Eisenkiesel" quartz with smoky quartz and hematite on a 8 cm wide sample from Zobes, Voigtland, Saxony.
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54081 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:45 Post subject: Re: Andreas Gerstenberg Collection |
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Pale yellow baryte crystal from the Churprinz mine, Großschirma, Freiberg district, Erzgebirge, Saxony. About 4,5 cm high crystal.
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:46 Post subject: Re: Andreas Gerstenberg Collection |
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With label from the Dittmersch collection, dating from 1918.
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54119 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:57 Post subject: Re: Andreas Gerstenberg Collection |
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Hi, Ed, if you read this: you asked Tobias for some fluorites from seldom shown German localities - as a starter the four of them for you. Beginning with a corroded crystal (6 cm) from the Stecklenberg quarry, Stecklenburg near Thale, Harz. In this quarry a find was made about the year 1900 which contained beautiful pale violet fluorite crystals arranged with black schorl, apatite and smoky quartz. If you come to Berlin one day you can see a sample in the Naturkundemuseum which is much better than the shown one;-). But nevertheless I am proud of possessing a fluorite from Stecklenberg... It comes from the Berlin collection of Fritz Seliger. This man has been the gem prospector in order of the German Emperor!
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:58 Post subject: Re: Andreas Gerstenberg Collection |
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Good yellow fluorites come from the Hilfe Gottes mine near Memmendorf, Freiberg district, Erzgebirge, Sachsen. The pic shows a 12 cm wide specimen with little pyrite on quartz.
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54310 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:59 Post subject: Re: Andreas Gerstenberg Collection |
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They occur also at the border between the "Granulitgebirge" and the Freiberg mining district, Saxony. That´s where this specimen comes from: the Alte Augustus Stolln, Hasensprung near Rosswein. Samples like this (and from other localities like Schönborn-Dreiwerden too) are looked for and very rare. The cubes on this sample measure up to 1 cm and are accompanied with some baryte.
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54089 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 05:59 Post subject: Re: Andreas Gerstenberg Collection |
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Here you have a really unusual locality: pale green cubes from the Lieth lime quarry, Elmshorn near Hamburg. This locality is the only outcrop of the Perm decade in northern Germany. Here copper shists are found laying over "Zechstein"-gypsum. In this copper shist you have sometimes fluorite cubes but good specimens are rare.
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54054 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 06:09 Post subject: Re: Andreas Gerstenberg Collection |
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And some more...
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This dolomite pseudo is definitely a favourite of mine. You know these pseudos after calcite scalenohedrons very well from the Schlema district, Erzgebirge, Saxony. But - this one is from Freiberg, precisely from the Abraham Shaft. It comes from a miner collection and was collected in the 1920s. It is the first one I ever saw from Freiberg and I think it will be the last... |
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54020 Time(s) |
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Very similar to bismuthinite occurs emplectite from Altenberg. Here golden needles up to 2 cm with small pale bluish fluorite octahedrons and hematite in a vug from the Vereinigt Feld tin mine. |
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54097 Time(s) |
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Not even frequent is bismuthinite from Altenberg, Erzgebirge, Saxony. The pic shows a 1 x 1 cm needle aggregate on fluorite and quartz from the Römer Shaft, dating from the 1950s. |
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54073 Time(s) |
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Another good locality in Brandenburg are the claypits around Bad Freienwalde, some 80 km in the east of Berlin. There come very good gypsum samples, occuring in christmas tree-like aggregates up to 40 cm. From the northern claypit is this cute specimen with greenish calcite on lime stone. |
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54045 Time(s) |
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Although Berlin and Brandenburg are not even blessed with mineral deposits we have... amber! At some places masses of them but deep in the ground;-) Sometimes they raise up to daylight like this classic specimen (about 7 cm in width) from the gravel pit at the Pinnower Bernsteinsee (amber lake, sic!) near Velten, Brandenburg. The old pit is today a lake where you can waterski... |
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54040 Time(s) |
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Good dark orange baryte crystals on hematite from the Krunkelbach Uranium prospect, Menzenschwand, Black Forest. Sample 7 cm. |
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54061 Time(s) |
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Silvery millerite sprays (up to 7 mm) from the Wehrendorf clay pit near Bad Essen, Westphalia. |
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54083 Time(s) |
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A kind of my hobbyhorse are German precious stones like this clear quartz (2.5 ct) from the Ossling quarry near Hoyerswerda, Saxony. |
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54068 Time(s) |
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Nice colorless baryte crystal (1,2 cm with hematite inclusions) on alterated dolomite from the Gehn quarry, Uffeln, Munsterland, Westphalia. |
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54054 Time(s) |
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Bizarre gypsum aggregate (10 cm width) from Nietleben near Halle, Saxony-Anhalt. |
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54048 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 06:14 Post subject: Re: Andreas Gerstenberg Collection |
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...the next...
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A good sample with greenish brown sphalerite crystals and some quartz. Old find (7 cm) from Lautenthal, Harz. There you can find nice crystals even today. But the shown quality I never saw during my visits on the dumps, so I had to buy this nice oldtimer... |
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54035 Time(s) |
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Germany is not very famous for its good turquoise specimens - but we do have them! The classic "turquoise-province" is the saxonian Voigtland. The shown sample comes from a small outcrop due to conduit workings near Altmannsgrün. The turqouise layer on this sample is 3 mm thick, sample width about 9 cm. |
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54038 Time(s) |
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Nice schorl crystals (3,5 cm) with muscovite from the Papiermühle granite gravel pit near Selb, Fichtelgebirge, Bavaria. |
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54002 Time(s) |
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Quartz crystals in front of a East Berlin winter sundowner... The crystals are up to 4 cm, they come from the Simon Bogners Neuwerk mine, Brand-Erbisdorf, Freiberg district, Erzgebirge, Saxony. There was found just one big vug full of good crystals which are sought-after by local collectors. |
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54014 Time(s) |
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Blackish grey jordisite - a rare mo-sulfide from the Glückauf Shaft (type locality), Langenau, Freiberg district, Erzgebirge, Saxony. 6,5 cm sample. |
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54076 Time(s) |
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Yet another type locality: 15 mm octahedron-like mellite crystal from the Auguste coal mine, Artern, Thuringia. This is where the best German mellites come from even if they cannot compete with the Hungarian crystals. |
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54019 Time(s) |
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Nice yellow tetrahedrons of the rare beryllium silicate helvite from the type locality, Unverhofft Glück mine near Antonsthal, Erzgebirge, Saxony. Sitting with some diopsite and sphalerite on calcite. The largest tetrahedron measures a little more than 3 mm. |
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54043 Time(s) |
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White gypsum needles on "fried" clay from the Basalt quarry Bauersberg near Bischofsheim, Rhön mountains, Bavaria. |
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54046 Time(s) |
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Another mineral which is widespread in northern Germany is flintstone. Some collectors do not understand why to pick up that stuff... But if they are as pretty as the shown zebra-like stone from the Segeberg forest near Bad Segeberg, Schleswig-Holstein it is worth it, I would say. 10 cm sample from a 1975 find. |
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54008 Time(s) |
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This 5 cm wide sample with corroded galenite crystals is from Freiberg too but not that old as the above shown dolomite. It comes from a little new find at the Rote Grube in the very "city center" of Freiberg. The find contained I think some ten specimens and the sample looks forward to become a classic rarity one day. |
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54041 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 06:19 Post subject: Re: Andreas Gerstenberg Collection |
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...more...
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Heidornite, a rare borate from the type locality, an oil drilling near Frenswegen, Nordhorn, Lower Saxony. Shown is a 4 mm crystalline aggregate coming up from 1968 m depth. Some of the rarest stuff you can get from Germany. |
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54019 Time(s) |
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White picromerite crystals (up to 2,5 cm) on halite from the 800 m level, Bergmannssegen-Hugo potash mine, Lehrte near Hannover, Lower Saxony. |
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54041 Time(s) |
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Pale green nodules of chrysocolla on calcite from Helgoland, Schleswig-Holstein. Picture width: 6 mm. |
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54066 Time(s) |
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Little yellow sal ammoniac crystals on "fried" conglomerate from the Alstaden coal mine, Oberhausen, Westphalia. Here gorgeous sceleton-crystals up to 3,5 cm were found but till I will get such a killer I make do with the shown one... |
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54023 Time(s) |
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About 3 cm measuring ulexite nodule (so-called "cotton ball") in massive anhydrite. Sample from the first place ulexite was found in Germany, the Niederellenbach quarry near Rothenburg, Hesse. From the collection of Sigmund Koritnig who described the mineral from Niederellenbach. |
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54044 Time(s) |
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A classic locality for siderite is Lobenstein in Thuringia. This is where the shown oldtimer is from: dark brown crystals with some pyrite scattered on. |
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54140 Time(s) |
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Siderite crystals are often found in siderite geodes in claypits. The - in my opinion - best examples were found in the claypit of Farmsen near Hildesheim, Lower Saxony. The pic shows a 9 cm wide sample with golden brown crystals. |
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54337 Time(s) |
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A very rare pseudo: asbolane after calcite crystals on quartz from the Gott segne beständig mine, Spitzleithe, Schneeberg district, Erzgebirge, Saxony (type locality of lithiophorite!). The mine produced a lot of pseudo´s in the old days, even very unusual ones like manganese oxide after pyromorphite. They are mentioned in the famous mineralogical lexicon of the saxonian localities by August Frenzel (1874). The shown 5 cm wide specimen comes from the well-known Bally-Prior collection of Schönenwerd, Switzerland. |
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54002 Time(s) |
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Phosphofibrite as concentric radials from the Wismut prospect near Röhrsdorf, Chemnitz, Saxony. Second find in Germany after Clara mine/Black Forest. |
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53986 Time(s) |
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Collecting minerals is sometimes quite a funny thing. You find them where you don´t consider them to be. This gypsum comes from the Jordansprudel, a mineral spring near Bad Oeynhausen, Westphalia. The crystals sometimes really plug the water pipes... |
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54019 Time(s) |
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 05, 2010 06:25 Post subject: Re: Andreas Gerstenberg Collection |
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That´s all folks. I hope, you enjoy viewing some specimens that are not shown that often. And if you want so, I can bother you with more;-) The photo quality is not the best but I hope it will be sufficient.
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6 mm ferristrunzite spray from a very rare locality: Langes Tal (long valley) near Neustadt, Harz. |
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54015 Time(s) |
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Fine colorless krausite needles from the Willi Agatz Shaft, Freital near Dresden, Saxony. Picture width: 4 mm. |
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54028 Time(s) |
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Dark red ianthinite crystals, alterating to yellow schoepite as a 3 mm aggregate on quartz from the Krunkelbach Uranium prospect, Menzenschwand, Black Forest. |
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54006 Time(s) |
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Something for the quartz collectors: orange chalcedony layered on quartz in form of dauphiné penetration twins from a new find at the Segen Gottes mine, Gersdorf, Freiberg district, Erzgebirge, Saxony. 7 cm in width. |
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54015 Time(s) |
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Hollow crystals of pyromorphite on limonite from the Dorothea Landeskrone mine, Clausthal-Zellerfeld, Harz. |
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54024 Time(s) |
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Pyromorphite crystal (2 mm) with a very intensive, "glowing" color. From the Giesenbach mine, Lahr, Black Forest. |
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54005 Time(s) |
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Besides for the classic "astrolite"-mica Neumark in Voigtland, Saxony is well-known for calcite specimens like the shown up to 3 cm crystals covered with pyrite. |
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53985 Time(s) |
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Pyrite in cuboctahedrons and tetrahedrons with calcite on ankerite. Old specimen from Kamsdorf in Thuringia. Picture width: 8 cm. |
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53986 Time(s) |
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Nice polished pastel agate from the classic location Wendelsheim near Alzey, Rhineland-Palatinate. Sample 6 cm. |
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54042 Time(s) |
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Kidney-like malachite filling in dolomite vug. Old specimen (about 1920) from Altenmittlau, Spessart, Hesse. The vug measures 4 cm in height. |
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53990 Time(s) |
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Excellent Carneole with "craquelee"-structure and a fine fire-red color. Polished section, 6 cm in height from Grünewald, Niederlausitz, Brandenburg. |
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53984 Time(s) |
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Dark brown sphalerite twin (1 cm) on dolomite and quartz. Found in the Aurora mine, Ramsbeck, Sauerland. |
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54036 Time(s) |
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Antonio Alcaide
Site Admin
Joined: 23 Aug 2009
Posts: 314
Location: Spain
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Posted: Mar 05, 2010 15:02 Post subject: Re: Andreas Gerstenberg Collection |
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Thanks, Andreas. Your systematic but also aesthetic collection is exhaustive. I have had a very good time watching it. Go on, please. Man does not live by "killer specimens" alone.
The best the labels and the history behind the pieces.
Cheers,
Antonio
_________________ Life is the shortest crystal |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4108
Location: Germany
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Posted: Mar 06, 2010 04:36 Post subject: Re: Andreas Gerstenberg Collection |
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I agree with Antonio. I know Andreas' style of collecting and specimens from his collection for several years now, and i really admire the accuracy with which he is devoted to historical specimens from German localites. And his care for old (sometimes REALLY old) labels make his collection a commendable mixture of both mineralogy and history.
So please go on, Andreas, and "bother" us with more ;-)
Glückauf!
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 707
Location: Alaska
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Posted: Mar 07, 2010 03:39 Post subject: Re: Andreas Gerstenberg Collection |
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I like the gypsum specimen.
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Andreas Gerstenberg
Joined: 04 Mar 2010
Posts: 336
Location: Chemnitz
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Posted: Mar 08, 2010 06:05 Post subject: Re: Andreas Gerstenberg Collection |
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You want them, you´ll get them. Here´s the second package for you;-)
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A nice galena from Neudorf/Harz is hard to get, though. Nevertheless I´d say that getting a good fluorite from there is even harder. I bought this specimen with the declaration "Schönbrunn, Voigtland". But in fact it is an old classic from Neudorf with typical siderite and quartz crystals on the pale blue cubes as well as some sphalerite and galena in the shist matrix. Former collection of Bergdirector Geipel/Eisleben, dating from 1921 (without label, unfortunately). The cubes measure up to 2,5 cm. |
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53758 Time(s) |
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Where do good vivianites come from? Trepca, yes. Bolivia, yes. Germany... Germany? Yes!! There is a locality in Bavaria, the Bayerland mine near Waldsassen, Fichtelgebirge. This mine gave crystals up to 10 cm in pyrrhotite. Normally the bigger ones (5 cm and more) are rather irregular but this one (more than 9 cm!) isn´t. I would say it´s the best piece of my collection! |
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53677 Time(s) |
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A detail of the vivianite crystal |
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53668 Time(s) |
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Anthophyllite asbestos from the Kuhlenberg quarry, Silbach, Sauerland, Westphalia. About 8,5 cm in width. |
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53706 Time(s) |
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If you like Sweet Home mine rhodochrosites you´ll smile at me if I tell you that this is a very good Saxonian rhodochrosite sample. About 6,5 cm consisting of tiny saddle-shaped rhombs. From Alte Hoffnung Gottes mine, Kleinvoigtsberg, Freiberg district, Erzgebirge, Saxony. Rhodochrosite for itself is not that rare in Freiberg, but crystals are. Kleinvoigtsberg and Rothenfurth developed the best ones. Today it´s very hard to find any, this one I got at the Freiberg show in 2009. With two old labels (dating from 1901) - "Dialogit" is an old German name for rhodochrosite (being in use until approx. 1920). |
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Another systematic killer: native selenium with Sulphur in vial (as old as the hills...) from the known selenium mineral locality Tilkerode, Harz (type locality of naumannite and eskebornite and - as some experts say - even clausthalite). The vial is about 5,5 cm in length. |
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53680 Time(s) |
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Micromounting in the old days: little box with label, dating from 1875. |
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53635 Time(s) |
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Opened, showing the little massive pyrargyrite sample (3 cm) from Gesegnete Bergmannshoffnung mine, Obergruna, Freiberg district, Erzgebirge, Saxony. |
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53644 Time(s) |
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Pyrolusite pseudo after calcite scalenohedrons (covered with a thin hematite layer) from the Luthersteufe mine near Öhrenstock, Ilmenau, Thuringia. Classic sample, about 6,5 cm in height. Similar pseudos are known from the manganite locality Ilfeld, Harz or from the Westerwald, Rhineland-Palatinate. |
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53626 Time(s) |
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The man who crafted this label really loved his collection... All laborious handmade, former Antonjewitsch collection/Berlin (about 1950). |
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53670 Time(s) |
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