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Clay pit, Bad Freienwalde, Märkisch-Oderland, Brandenburg, Germanyi
Regional Level Types
Clay pitPit (Reclaimed)
Bad FreienwaldeTown
Märkisch-OderlandDistrict
BrandenburgState
GermanyCountry

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Key
04689780015806875814736.jpg
View of the Bad Freienwalde clay mining area, in 1932.

Clay pit, Bad Freienwalde, Märkisch-Oderland, Brandenburg, Germany
00620150015806875821864.jpg
View of the Bad Freienwalde clay mining area, in 1908.

Clay pit, Bad Freienwalde, Märkisch-Oderland, Brandenburg, Germany
03042480015806875822236.jpg
View of the Bad Freienwalde clay mining area, in 1932.

Clay pit, Bad Freienwalde, Märkisch-Oderland, Brandenburg, Germany
06234980015806840864308.jpg
View of the Bad Freienwalde clay mining area, in 1932.

Clay pit, Bad Freienwalde, Märkisch-Oderland, Brandenburg, Germany
02992520015806844694833.jpg
View of the Bad Freienwalde clay mining area, in 1908.

Clay pit, Bad Freienwalde, Märkisch-Oderland, Brandenburg, Germany
07406660015806845452646.jpg
View of the Bad Freienwalde clay mining area, in 1932.

Clay pit, Bad Freienwalde, Märkisch-Oderland, Brandenburg, Germany
04689780015806875814736.jpg
View of the Bad Freienwalde clay mining area, in 1932.

Clay pit, Bad Freienwalde, Märkisch-Oderland, Brandenburg, Germany
00620150015806875821864.jpg
View of the Bad Freienwalde clay mining area, in 1908.

Clay pit, Bad Freienwalde, Märkisch-Oderland, Brandenburg, Germany
Latitude & Longitude (WGS84):
52° 47' North , 14° 0' East
Latitude & Longitude (decimal):
Locality type:
Pit (Reclaimed) - last checked 2020
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Bad Freienwalde13,075 (2015)2.1km
Falkenberg2,462 (2017)3.7km
Hohenfinow536 (2011)6.0km
Niederfinow652 (2011)7.4km
Liepe801 (2011)9.0km
Name(s) in local language(s):
Tongruben ("Südgrube" and "Nordgrube"), Bad Freienwalde, Brandenburg, Deutschland


The mining district of Bad Freienwalde is probably the best-known Brandenburg locale after Rüdersdorf (the famous celestines...). There was mainly clay mined at Freienwalde but also brown coal, sandstone, sand and iron ore (limonite). The clay was used for brick production since 1414 (!) and - hence it bears a lot of sulfate - alun (between 1717 and 1845). Interesting enough that Bad Freienwalde is a mentioned locality for epsomite in the 19th Century literature. What is quite remarkable for Brandenburg is that the alun clay was mined in adits of which three or four portals are still present today (f.e. the gerhard adit near the Teufelssee lake).

There are two main clay pits that are important for mineral and fossil collectors. The Tonberg clay pit ("nothern mine") and the Hammerthal clay pit ("southern mine"). Both are abandoned now, the northern pit produced since some ten years ago. The Hammerthal, a small valley near the Teufelsee lake was named for a hammer mill that the worked on the quite massive limonite layers since 1719.

As mentioned before, Bad Freienwalde was a known locality for epsomite in the past. This mineral occurs in the south pit in fibrous colourless to white crystals up to 1-1,5 cm directly on the clay. However, THE mineral at Freienwalde is the gypsum. There are so many varieties: various single crystals, different types of roses, tree-shaped aggregates (that made the locality quite famous) and so on. The roses reached 30 cm in diameter, the single crystals not often more that 7 cm. In the 1990s there was found a 40 cm "tree" in the south pit - a remarkable specimen!

The big gypsums all come from the south pit, the Tonberg pit just produced small crystals and bizarre etched aggregates with brown phantoms of clay and coal. Most of the minerals in the list occured in the north pit. However, most of these where single finds. Unfortunately the locality is just a locally known one. And even here most collectors say, well, it´s just gypsum...

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


16 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Aluminite
Formula: Al2(SO4)(OH)4 · 7H2O
Reference: Baumgärtl,U. (2006). Mineralien aus Bad Freienwalde. Aufschluss, Jg.57, Nr.6, S.359-72.
'Amber'
Reference: Andreas Gerstenberg collection
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: Andreas Gerstenberg collection
'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Reference: Andreas Gerstenberg collection
Calcite
Formula: CaCO3
Reference: SCHROEDER, J.H.: Bad Freienwalde-Parsteiner See (Führer zur Geologie von Berlin und Brandenburg Nr.2), Berlin, 1994
Copiapite
Formula: Fe2+Fe3+4(SO4)6(OH)2 · 20H2O
Reference: Andreas Gerstenberg collection
Epsomite
Formula: MgSO4 · 7H2O
Reference: Baumgärtl,U. (2006). Mineralien aus Bad Freienwalde. Aufschluss, Jg.57, Nr.6, S.359-72.
'Glauconite'
Formula: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Reference: Andreas Gerstenberg collection
Goethite
Formula: α-Fe3+O(OH)
Reference: Andreas Gerstenberg collection
Gypsum
Formula: CaSO4 · 2H2O
Reference: http://www.mffb.de/MFFB_Exkursionsberichte/Freienwalde/Freienwalde.htm
Hexahydrite
Formula: MgSO4 · 6H2O
Reference: Andreas Gerstenberg collection
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Andreas Gerstenberg collection
Lepidocrocite
Formula: γ-Fe3+O(OH)
Reference: Andreas Gerstenberg collection
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Andreas Gerstenberg collection
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Andreas Gerstenberg collection
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Andreas Gerstenberg collection
'Psilomelane'
Formula: Mn, O
Reference: Andreas Gerstenberg collection
Pyrite
Formula: FeS2
Reference: Baumgärtl,U. (2006). Mineralien aus Bad Freienwalde. Aufschluss, Jg.57, Nr.6, S.359-72.
Rozenite
Formula: FeSO4 · 4H2O
Reference: Baumgärtl,U. (2006). Mineralien aus Bad Freienwalde. Aufschluss, Jg.57, Nr.6, S.359-72.;
Salammoniac
Formula: NH4Cl
Reference: Andreas Gerstenberg collection
Siderite
Formula: FeCO3
Reference: Andreas Gerstenberg collection
Szomolnokite
Formula: FeSO4 · H2O
Reference: Andreas Gerstenberg collection

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 3 - Halides
Salammoniac3.AA.25NH4Cl
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Lepidocrocite4.FE.15γ-Fe3+O(OH)
Magnetite4.BB.05Fe2+Fe3+2O4
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Aluminite7.DC.05Al2(SO4)(OH)4 · 7H2O
Copiapite7.DB.35Fe2+Fe3+4(SO4)6(OH)2 · 20H2O
Epsomite7.CB.40MgSO4 · 7H2O
Gypsum7.CD.40CaSO4 · 2H2O
Hexahydrite7.CB.25MgSO4 · 6H2O
Rozenite7.CB.15FeSO4 · 4H2O
Szomolnokite7.CB.05FeSO4 · H2O
Group 9 - Silicates
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Amber'-
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
'Glauconite'-(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
'Limonite'-(Fe,O,OH,H2O)
'Psilomelane'-Mn, O

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Lepidocrocite6.1.2.2γ-Fe3+O(OH)
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 9 - NORMAL HALIDES
AX
Salammoniac9.1.3.1NH4Cl
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Siderite14.1.1.3FeCO3
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Epsomite29.6.11.1MgSO4 · 7H2O
Gypsum29.6.3.1CaSO4 · 2H2O
Hexahydrite29.6.8.1MgSO4 · 6H2O
Rozenite29.6.6.1FeSO4 · 4H2O
Szomolnokite29.6.2.2FeSO4 · H2O
Group 31 - HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq·xH2O
Aluminite31.7.4.1Al2(SO4)(OH)4 · 7H2O
Miscellaneous
Copiapite31.10.5.1Fe2+Fe3+4(SO4)6(OH)2 · 20H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
'Glauconite'71.2.2a.5(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Mixtures, etc.
'Amber'-
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Kaolinite-Al2(Si2O5)(OH)4
'Limonite'-(Fe,O,OH,H2O)
'Psilomelane'-Mn, O

List of minerals for each chemical element

HHydrogen
H GypsumCaSO4 · 2H2O
H RozeniteFeSO4 · 4H2O
H EpsomiteMgSO4 · 7H2O
H AluminiteAl2(SO4)(OH)4 · 7H2O
H CopiapiteFe2+Fe43+(SO4)6(OH)2 · 20H2O
H BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
H Goethiteα-Fe3+O(OH)
H Limonite(Fe,O,OH,H2O)
H Lepidocrociteγ-Fe3+O(OH)
H KaoliniteAl2(Si2O5)(OH)4
H MuscoviteKAl2(AlSi3O10)(OH)2
H SalammoniacNH4Cl
H Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
H SzomolnokiteFeSO4 · H2O
H HexahydriteMgSO4 · 6H2O
H ApatiteCa5(PO4)3(Cl/F/OH)
CCarbon
C SideriteFeCO3
C CalciteCaCO3
NNitrogen
N SalammoniacNH4Cl
OOxygen
O GypsumCaSO4 · 2H2O
O RozeniteFeSO4 · 4H2O
O SideriteFeCO3
O CalciteCaCO3
O EpsomiteMgSO4 · 7H2O
O AluminiteAl2(SO4)(OH)4 · 7H2O
O CopiapiteFe2+Fe43+(SO4)6(OH)2 · 20H2O
O BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
O Goethiteα-Fe3+O(OH)
O Limonite(Fe,O,OH,H2O)
O Lepidocrociteγ-Fe3+O(OH)
O KaoliniteAl2(Si2O5)(OH)4
O MagnetiteFe2+Fe23+O4
O MuscoviteKAl2(AlSi3O10)(OH)2
O PsilomelaneMn, O
O Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
O SzomolnokiteFeSO4 · H2O
O HexahydriteMgSO4 · 6H2O
O ApatiteCa5(PO4)3(Cl/F/OH)
FFluorine
F BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
F ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Na Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
MgMagnesium
Mg EpsomiteMgSO4 · 7H2O
Mg BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Mg Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Mg HexahydriteMgSO4 · 6H2O
AlAluminium
Al AluminiteAl2(SO4)(OH)4 · 7H2O
Al BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Al KaoliniteAl2(Si2O5)(OH)4
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
SiSilicon
Si BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Si KaoliniteAl2(Si2O5)(OH)4
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
S GypsumCaSO4 · 2H2O
S RozeniteFeSO4 · 4H2O
S EpsomiteMgSO4 · 7H2O
S AluminiteAl2(SO4)(OH)4 · 7H2O
S PyriteFeS2
S CopiapiteFe2+Fe43+(SO4)6(OH)2 · 20H2O
S SzomolnokiteFeSO4 · H2O
S HexahydriteMgSO4 · 6H2O
ClChlorine
Cl SalammoniacNH4Cl
Cl ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
K BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
K MuscoviteKAl2(AlSi3O10)(OH)2
K Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
CaCalcium
Ca GypsumCaSO4 · 2H2O
Ca CalciteCaCO3
Ca ApatiteCa5(PO4)3(Cl/F/OH)
MnManganese
Mn PsilomelaneMn, O
FeIron
Fe RozeniteFeSO4 · 4H2O
Fe SideriteFeCO3
Fe PyriteFeS2
Fe CopiapiteFe2+Fe43+(SO4)6(OH)2 · 20H2O
Fe BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Fe Goethiteα-Fe3+O(OH)
Fe Limonite(Fe,O,OH,H2O)
Fe Lepidocrociteγ-Fe3+O(OH)
Fe MagnetiteFe2+Fe23+O4
Fe Glauconite(K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
Fe SzomolnokiteFeSO4 · H2O

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Dr. Wiegers, Fritz (1922): Geologisches Wanderbuch für die Umgebung von Berlin, Stuttgart: Enke, pp.128-11.
Schroeder, J.H. (1994): Bad Freienwalde-Parsteiner See (Führer zur Geologie von Berlin und Brandenburg Nr.2), Berlin (2nd ed.)
Baumgärtl, U. (2006): Mineralien aus Bad Freienwalde. In: Aufschluss, 57, vol.6, pp.359-72.

External Links


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This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
 
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