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Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany

This page kindly sponsored by Carsten Slotta / MinTreasure.com
 
Latitude & Longitude (WGS84): 48° 22' 60'' North , 8° 14' 47'' East
Latitude & Longitude (decimal): 48.3833333333, 8.24638888889
Name(s) in local language(s): Grube Clara, Rankachtal, Oberwolfach, Wolfach, Schwarzwald, Baden-Württemberg, Deutschland
 
Located in the upper Rankach valley, about 7 km north of Oberwolfach and about 9 km north of Wolfach. The dumps and processing plant are located in the Kinzig valley near Hausach, about 1 km south of Wolfach. Permission and fee are required to collect on the dumps (prior to June 2007 this was possible Mo-Th 9 am - 5 pm and Fr 9 am - 2 pm).

Barite-fluorite veins including copper, silver and lead minerals, hosted by gneisses and Triassic sandstones. Four mineralisation episodes are known (Huck, 1984). The mine was started in 1726 and is presently owned by the Sachtleben company, who works it for barite and fluorite (and occasionally silver ore). It is presently the only operating mine in the Black Forest. In 2004, the 700 m underground level was reached.

IMPORTANT NOTE (June 2007): A change to the collecting policy was introduced by the Sachtleben company in June 2007: collecting is now only allowed in a fenced-in area of the dumps, in a new spot next to the processing plant.
Collecting is possible from 9 am to 5 pm, also on weekends (new truckloads of material will be brought in regularly).
Children are allowed to collect (previously only persons aged 18 and over are allowed to collect). The collecting fee is 8 Euro for ages 15 and above, and 4 Euro for ages 14 and below; 8 kg of material is free, each excess kg costs 50 cents.

New access rules since 2010:
The new dump will be open only during the collecting season. Access will therefore be possible only until 30 October 2010, and then again starting in 1 April 2011.
(Details in German: http://www.baden-online.de/news/artikel.phtml?page_id=69&db=news_lokales&table=artikel_kinzigtal&id=8188 ; http://www.mineralienhalde.de/index.html ; http://www.clara-mineralien.de/mineralienhalde/index.php ; http://www.mineralienatlas.de/?l=252).


IMPORTANT NOTES on the mineral list (regularly updated by Uwe Kolitsch):

- NOTE: Due to an unsolved bug, new finds can currently only be added manually to the database, which usually takes some time (10/2015-2/2016). The corresponding references will be added immediately to the list of references.

- The osarizawaite described from the Clara mine [SCHNORRER-KÖHLER, G. (1988): Osarizawait, PbCuAl2(SO4)2(OH)6, ein Mineral der Alunit-Beudantit-Crandallit-Gruppe aus der Grube Clara im Schwarzwald. - Aufschluss, 39 (1), 49-51. (in German)] later was found to be a complex solid-solution member of the crandallite group instead [KOLITSCH, U., BLASS, G., GRAF, H.-W. & GRÖBNER, J. (2004): Neufunde aus der Grube Clara im mittleren Schwarzwald. Lapis 29 (2) 18-23; 50. (in German)]

- Mckinstryite originally reported (and sold by a mineral dealer) in around 2004/2005 is highly questionable [KOLITSCH, U., GRÖBNER, J. BLASS, G., GRAF, H.-W. & PRING, A. (2005): Neufunde aus der Grube Clara im mittleren Schwarzwald (II): Dreyerit, Gasparit-(Ce), Klinobisvanit, Kobaltkoritnigit, Metatyuyamunit, Roscoelith, Sengierit, Vésigniéit und Wakefieldit. Lapis 30 (9), 35-39; 58.]. However, mckinstryite has been confirmed in 2009 on two different specimens (Kolitsch, 2010; Kolitsch et al., 2010).

- Reported zinckenite is highly questionable [Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Weise (Munich), 336 pp. (in German)]

- Oppelt, W., Hehl, W. & Duffner, J. (1988): Mineralien der Grube Clara. Der Erzgräber, 2, 91-96 (in German). list "Allanit" without any description or reference. Thus, is has not been included here.

Mindat Articles

Olivenite habits from Grube Clara by Dominik Schläfli


Mineral List

Acanthite
Actinolite
Adamite
var: Cuprian Adamite
Agardite-(Ce) (TL)
Agardite-(La)
Agardite-(Y)
Akaganeite
Albite
Alloclasite
Allophane
Almandine
Alum-(K)
Ammoniojarosite
Anatase
Anglesite
Anhydrite
Ankerite ?
Annabergite
Antlerite
Aragonite
Arsenbrackebuschite (TL)
Arsenic
Arseniosiderite
Arsenocrandallite
Arsenogorceixite (TL)
'Arsenogorceixite-Arsenogoyazite Series'
Arsenogoyazite (TL)
Arsenolite
Arsenopyrite
Arsentsumebite
Arthurite
Atacamite
Atelestite
Aurichalcite
Autunite ?
Azurite
Babánekite
Bararite
Bariopharmacosiderite (TL)
Baryte
Bassetite
Bastnäsite-(Ce)
Bastnäsite-(La)
Bastnäsite-(Nd)
Bayldonite
'Beaverite-(Cu)'
Becquerelite
Benauite (TL)
Benjaminite
Beraunite
Bernalite
Berryite
Beudantite
Beyerite
Billietite
Billingsleyite
Bindheimite
'Biotite'
Birnessite
Bismuth
Bismuthinite
Bismutite
Bismutoferrite
Bohdanowiczite
Bornite
Brochantite
Bromargyrite
Brookite
Cacoxenite
Calcioandyrobertsite
Calcite
Caledonite
Camérolaite
Carbonatecyanotrichite
Carlhintzeite
Carminite
Carnotite
Cassiterite
Cattierite
Celadonite
Celestine
Cerianite-(Ce)
Cerussite
Cervantite
Cesàrolite
Chalcanthite
Chalcocite
Chalcophyllite
Chalcopyrite
Chalcosiderite
Chenevixite
Chlorargyrite
'Chlorite Group'
Chromite
Chrysocolla
Chukhrovite-(Ce)
Cinnabar
Clairite
Claraite (TL)
Clinobisvanite
Clinochlore
Clinoclase
'Clinotyrolite'
Cobaltite
Cobaltkoritnigite
Conichalcite
Connellite
Copiapite
Copper
Coquimbite
Cordierite
Corkite
Cornubite
Cornwallite
Coronadite
Cotunnite
Covellite
Crandallite
Cryptohalite
Cryptomelane
Cualstibite (TL)
'Cualstibite-1M' (FRL)
Cuprite
var: Chalcotrichite
Cuprobismutite
Cuproroméite
Cuprotungstite
Cyanotrichite
Delafossite
Descloizite
Devilline
Diadochite
Digenite
Djurleite
Dolomite
Doyleite
Dravite
Dreyerite
Dufrénite
Duftite
Dussertite
'Elsmoreite Group
var: Jixianite'

Elyite
Emplectite
Enargite
Erythrite
Ettringite
Eulytine
Famatinite
Ferberite
Feroxyhyte
Ferrihydrite
Ferrilotharmeyerite
Florencite-(Ce)
Florencite-(La)
Fluocerite-(Ce)
Fluocerite-(La)
Fluorapatite
Fluorite
var: Stink-Fluss
Francevillite
Gahnite
Galena
Gartrellite
Gasparite-(Ce)
Gearksutite
Geerite
Geocronite
Gerhardtite
Gersdorffite
Gilmarite
Goethite
Gold
Gorceixite
Goyazite
Graphite
Graulichite-(Ce)
Greenockite
Guanajuatite
Guérinite
Gustavite
Gypsum
Halite
'Halloysite'
Halloysite-7Å
Halotrichite
Hechtsbergite
Hematite
Hemimorphite
Heyrovskýite
Hloušekite
Hollandite
'Hornblende'
Hörnesite
Hübnerite
Hyalophane
Hydrocerussite
Hydrohalite
Hydrokenoelsmoreite
var: Ferritungstite
Hydrotalcite
Hydrotungstite
Hydrozincite
Ianthinite
Idaite
Ilmenite ?
Iodargyrite
Jalpaite
Jarosite
Kaolinite
Kasolite
Kettnerite
'K Feldspar
var: Adularia'

Khaidarkanite
Kidwellite
Kintoreite
Koechlinite
Kornelite
Köttigite
Langite
'Laubmannite (of Moore)'
Laueite
Laumontite
Lavendulan
Leadhillite
Lenoblite
Lepidocrocite
Libethenite
'Limonite'
Linarite
Lindackerite
Lindbergite
Lipscombite
Löllingite
Lotharmeyerite
Lukrahnite
Luzonite
Magnesiochromite
Magnesite
Magnetite
Malachite
Manganite
'Manganogel'
Marcasite
Mascagnite
Massicot
Matildite
Mawbyite
Mckinstryite
Melanterite
Mercury
Mereheadite
Meta-autunite
Metaheinrichite
Metanováčekite
Metaschoepite ?
Metatorbernite
Metatyuyamunite
Metazeunerite
Meurigite-K
Meymacite
Mimetite
Mixite
Mohrite
Molybdenite
Monazite-(Ce)
Monazite-(La)
Monohydrocalcite
Montmorillonite
Moolooite
Mottramite
Muscovite
var: Illite
var: Sericite
Namibite
Naumannite
Nickelskutterudite
Nickeltsumcorite
Nontronite
Nováčekite-II
Nsutite
Ogdensburgite
Olenite
Olivenite
var: Zincian Olivenite
Omphacite
Opal
var: Opal-AN

Orthoclase
Osarizawaite
Paraschoepite ?
Parasymplesite
Paratacamite
Parnauite
Pavonite
Pearceite
Perovskite
'Petrified Wood'
Pharmacosiderite
Phaunouxite
Philipsbornite
Philipsburgite
Phlogopite
Phosphofibrite (TL)
Phosphosiderite
Phyllotungstite (TL)
Pitticite
Plumbogummite
Plumbojarosite
Plumbonacrite
Polybasite
Polybasite-Tac
Polydymite
Posnjakite
Prehnite
Preisingerite
Prosopite
Protasite
Proustite
Pseudomalachite
Pucherite
Pyrargyrite
Pyrite
var: Bravoite
Pyrolusite
Pyromorphite
Pyrostilpnite
Pyrrhotite
Quartz
var: Agate
var: Amethyst
var: Aventurine
var: Carnelian
var: Chalcedony
var: Eisenkiesel
var: Milky Quartz
var: Rock Crystal
var: Smoky Quartz
Rammelsbergite
Ramsdellite
Rankachite (TL)
Raspite
Rauenthalite
Rhabdophane-(Ce)
var: Plumboan Rhabdophane-(Ce)
Rhabdophane-(La)
Rhabdophane-(Nd)
Rhodochrosite
Rhomboclase
Richelsdorfite
Rockbridgeite
Romanèchite
'Roméite Group'
'var: Bismutostibiconite' (FRL)
Römerite
Rooseveltite
Roscoelite
Rosiaite
Rouaite
Rozenite
Russellite
Rutile
Safflorite
Sainfeldite
Scheelite
Schoepite
Schorl
Schumacherite
Scorodite
Scotlandite
Seelite
Segnitite
Selenium
Sellaite
Semseyite
Sengierite
Serpierite
Siderite
'Siderogel'
Siderotil
Sillimanite
Silver
Skinnerite
Skutterudite
Smithsonite
Smythite
Spertiniite
Sphalerite
Spionkopite
Stewartite
'Stibiconite'
Stibnite
Stolzite
Strashimirite
Strengite
Stromeyerite
Strontianite
Studtite
Sulphur
Susannite
Svabite
Symplesite
Synchysite-(Ce)
Szomolnokite
Takovite
Tennantite
Tenorite
Tetrahedrite
Theisite
Thometzekite
Tinticite
Titanite
Todorokite
Torbernite
Tripuhyite
Tschermigite
Tsumcorite
Tsumebite
Tungstibite (TL)
Tyrolite
Tyuyamunite
'UKI-1975-(SO:AlCu)'
'UKI-2004-(OS:BiCuPb)'
'UM1975-08-AsOSO:FeHPb'
'UM1999-38-WO:CrV'
'UM2005-31-SiO:CuH'
Umangite
'Unnamed (Ba-analogue of Calcioaravaipaite)'
'Unnamed (Ca Arsenate Hydrate II)'
'Unnamed (Ce Tungstate)'
'Unnamed (Kogarkoite-like mineral)'
'Unnamed (Nd-analogue of Yttrotungstite-(Ce))'
'Unnamed (P-analogue of Schultenite)'
'Unnamed (Pb Oxysulphate Hydrate)'
Uraninite
var: Pitchblende
Uranophane
Uranosphaerite
Uranotungstite (TL)
Uricite
Usovite
Vaesite
Varlamoffite ?
Vaterite
Vauquelinite
Vésigniéite
Volborthite
Voltaite
Vyacheslavite
Wakefieldite-(Ce)
Walpurgite
Wittichenite
Wroewolfeite
Wulfenite
'Xanthochroite'
Xenotime-(Y)
Yarrowite
Yukonite
Zálesíite
Zeunerite
Zharchikhite
Zincolivenite
Zippeite
Zircon


464 entries listed. 411 valid minerals. 13 (TL) - type locality of valid minerals. 2 (FRL) - first recorded locality of unapproved mineral/variety/etc. 2 erroneous literature entries.

The above list 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.

References

Kirchheimer, F. (1951) Die Uranerzvorkommen im mittleren Schwarzwald. Mitteilungsblatt der Badischen Geologischen Landesanstalt, 2-66 (in German).

Walenta, K. (1975) The secondary minerals of the barite vein of the Clara mine near Oberwolfach, central Black Forest. Aufschluss, 26, 369-411. (in German)

Kaiser, H. (1984) Die Grube Clara zu Wolfach im Schwarzwald. Verlag Karl Schillinger, Freiburg im Breisgau, 102 pp. (in German)

Rocks & Minerals (1981) 56: 233.

Rocks & Minerals (1987) 62: 320.

Rocks & Minerals: 65 (1990) 448-454.

Huck, K. (1984) Die Beziehungen zwischen Tektonik und Paragenese unter Berücksichtigung geochemischer Kriterien in der Fluß- und Schwerspatlagerstätte "Clara" bei Oberwolfach/Schwarzwald. Ph.D. Thesis, Ruprecht-Karls-Universität Heidelberg. (in German)

Walenta, K. (1992) Die Mineralien des Schwarzwaldes. Weise (Munich), 336 pp. (in German)

Kolitsch, U., Gröbner, J., Bayerl, R. (1995) Die Mineralien der Silber-Antimon-Vererzungen der Grube Clara im Zeitraum 1993 bis 1995. Erzgräber 9 (2), 61-77. (in German)

Preite, D., Cini, V. (1997) La miniera di Grube Clara. Rivista Mineralogica Italiana 1997 (1), 19-49. (in Italian)

Kolitsch, U., Graf, H.W., Blaß, G. (1997) Untersuchungen über die Seltenerden-Carbonate Bastnäsit und Synchisit von der Grube Clara im Schwarzwald: Nachweis von Bastnäsit-(Ce), Bastnäsit-(Nd), Bastnäsit-(La) und Synchisit-(Ce). Aufschluss 48, 367-379.

Lapis 8(7/8), 11-36. (in German)

Gröbner, J., Kolitsch, U. (1999) Mineralien- und Literaturliste der Grube Clara bei Oberwolfach. Erzgräber 13 (1), 1-13. (in German)

Kolitsch, U., Götzinger, M. (2000) Einige Neufunde aus der Grube Clara im mittleren Schwarzwald: Eulytin, Namibit, Volborthit, Gearksutit, Spertiniit, Monazit-(La), Protasit, Sainfeldit, Cyanotrichit und Vauquelinit. Erzgräber 14, 33-47. (in German)

Kolitsch, U. (2000) Eine durch Betoneinwirkung entstandene Paragenese von Blei-Verbindungen aus der Grube Clara im mittleren Schwarzwald. Erzgräber 14, 48-53. (in German)

Wendel, W., Bayerl, R., Oppelt, W. (2001) Die Mineralien der Grube Clara bei Oberwolfach. Lapis 26 (7-8), 27-54. (in German) [part of Lapis special issue on the Clara mine]

Zhu, Y. (2001) Hydrogeologie und Gestein-Wasser Reaktionen in der Grube Clara, Schwarzwald. Freiburger Geowissenschaftliche Beiträge 15, 145 pp.

Zhu, Y., Merkel, B.J., Stober, I., Bucher, K. (2003) The hydrogeochemistry of arsenic in the Clara mine, Germany. Mine Water and the Environment 22, 110-117.

Zhu, Y. (2003) Mixing of different waters and formation of secondary barite in the Clara mine, Black Forest, Germany. Guilin Gongxueyuan Xuebao 23, 241-250 (in Chinese.)

Kolitsch, U., Blaß, G., Graf, H.-W., Gröbner, J. (2004) Neufunde aus der Grube Clara im mittleren Schwarzwald. Lapis 29 (2) 18-23; 50. (in German)

Werner, W., Markl, G. (2005) Hydrothermalgänge im Schwarzwald – Bergbau, Entstehung und Lagerstättenpotenzial. Mitt. Österr. Mineral. Ges. 151, 121. (in German)

Kolitsch, U., Gröbner, J., Blaß, G., Graf, H.W., Pring, A. (2005) Neufunde aus der Grube Clara im mittleren Schwarzwald (II): Dreyerit, Gasparit-(Ce), Klinobisvanit, Kobaltkoritnigit, Metatyuyamunit, Roscoelith, Sengierit, Vésigniéit und Wakefieldit. Lapis 30 (9), 35-39; 58. (in German)

Gröbner, J., Kolitsch, U., Bayerl, R. (2005) Interessante Uranmineralien im Stinkspat der Grube Clara. Lapis 30 (10), 34-39; 90. (in German)

Gröbner, J., Bayerl, R., Kolitsch, U. (2006) Weitere Beobachtungen zu den Uran- und Vanadium-Paragenesen der Grube Clara aus den Jahren 2002, 2004 und 2005. Erzgräber 20, 1-10. (in German)

Kolitsch, U., Gröbner, J., Blaß, G., Graf, H.-W. (2007) Neufunde aus der Grube Clara im mittleren Schwarzwald (III): Cerianit-(Ce), Dravit, Florencit-(La), Gilmarit, Olenit und Scotlandit. Lapis 32 (6), 19-23; 70. (in German)

Blass, G., Graf, H.W., Sebold, D. (2009) Neue Mineralien von der Grube Clara im Kinzigtal. Mineralien-Welt 20 (1), 87-89. (in German)

Pfaff, K., Romer, R.L.,Markl, G. (2009) U-Pb ages of ferberite, chalcedony, agate, 'U-mica' and pitchblende: constraints on the mineralization history of the Schwarzwald ore district. European Journal of Mineralogy 21, 817-836.

Bucher, K., Zhu, Y., Stober, I. (2009) Groundwater in fractured crystalline rocks, the Clara mine, Black Forest (Germany). International Journal of Earth Sciences 98, 1727-1739.

Kolitsch, U. (2010) The crystal structure and compositional range of mckinstryite. Mineralogical Magazine 74, 73-84.

Kolitsch, U., Gröbner, J., Brandstätter, F., Bayerl, R. (2010) Neufunde aus der Grube Clara im mittleren Schwarzwald (IV): Calcioandyrobertsit, Cotunnit, Gerhardtit, Khaidarkanit, Lukrahnit, Mckinstryit, Moolooit, Rhabdophan-(La), Rouait und Uricit. Lapis 35 (9), 22-27; 62. (in German)

Schimak, F., Härer, J. (2010) Die Paragenese der Eisenphosphate aus der Grube Clara. Mineralien-Welt 21 (4), 18-30. (in German)

Milke, R., Schimak, F. (2011) Greenockit aus der Grube Clara. Mineralien-Welt, 22 (3), 36-37. (in German)

Loges, A., Wagner, T., Barth, M., Bau, M., Göb, S., Markl, G. (2012) Negative Ce anomalies in Mn oxides: the role of Ce4+ mobility during mineral-water interaction. Geochim. Cosmochim. Acta 86, 296-317.

Pfaff, K., Staude, S., Markl, G. (2012) On the origin of sellaite (MgF2)-rich deposits in Mg-poor environments. American Mineralogist, 97, 1987–1997.

Mills, S. J., Kampf, A. R., McDonald, A. M., Bindi, L., Christy, A. G., Kolitsch, U. & Favreau, G. (2013) The crystal structure of parnauite: a copper arsenate‒sulphate with translational disorder of structural rods. European Journal of Mineralogy, 25, 693-704. [study includes material from Clara mine]

Kolitsch, U., Giester, G. (2014) A new calcium arsenate mineral, Ca3(AsO4)2•~5.9H2O, and its crystal structure. 92nd Annual Meeting of the DMG, Jena, Germany, September 21-24; abstract in Programme, 265.

Van der Meersche, E. (2014) Kristallformen von Fluorit - Crystal forms. Author’s publishing, 296 pp. (bilingual German-English). [many photos and drawings of multi-faceted fluorite crystals from the Clara mine]

Schimak, F. (2014) Usovit und seltene Vanadium-Mineralien aus der Grube Clara. Lapis, 39 (4), 32-33 (in German).

Lehmann, G. (2015) Geostrukturelle Studie an Gesteinen der hydrothermalen Clara-Lagerstätte im Mittleren Schwarzwald. Bachelor Thesis, University of Freiburg, Germany, 60 pp. (in German)

Wendel, W. (2015) The Clara Mine, near Wolfach in the Black Forest, Germany: From the myth of the “Golden Calf” to modern mining. Rocks & Minerals 90, 34-55.

Blaß, G., Draxler, V. (2015) Babánekit, ein Erstfund für die Grube Clara im Schwarzwald. Mineralien-Welt 26 (6), 16-19 (in German).

Markl, G. (2015) Schwarzwald: Lagerstätten und Mineralien aus vier Jahrhunderten. Band I - Nordschwarzwald & Grube Clara. Bode Verlag, Salzhemmendorf-Lauenstein, Germany, 672 pp. (in German).

Niceus, G. (2015) Gediegen Silber aus der Grube Clara - ein Augenschmaus. Lapis 41 (1), 24-26 (in German).

Blaß, G., Kolitsch, U. and Draxler, V. (2016): Weitere Neubestimmungen von der Grube Clara in Wolfach, Schwarzwald: Lindackerit, Hloušekit und Metaheinrichit. Mineralien-Welt 27 (1), 56-58 (in German).

Slotta, C. (2016): Von Carlhintzeit bis Pradeit: Neue Mineralfunde aus dem Schwarzwald. Lapis 41 (2), 30-31 (in German).

Schimak, F. (2016): Strontianit und Coelestin aus der Grube Clara, Wolfach, Schwarzwald. Lapis 41 (3), 37-38 (in German).

External Links

http://www.rbmineral.de/claraliteratur.htm [Full list of references on www.rbmineral.de]

http://www.mineralienatlas.de/?l=252 [Mineralienatlas.de]

http://www.mineralienhalde.de/ [Official website of the new dump]



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