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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 on 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). Lists "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

Hidalgoite

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

Sklodowskite

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 (Ba-Mn Oxalate Tetrahydrate)'

'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


414 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)

Hajek, W. (2007): Bemerkenswerte Eigenfunde: Matildit von der Grube Clara. Lapis 32 (5), 23.

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]

http://www.stuttgarter-zeitung.de/inhalt.mineraliensuche-in-der-grube-clara-bizarre-schaetze-aus-dem-bauch-der-erde.17548ef4-1f0f-459c-8345-0b1fc9d0399a.html [Newspaper article on regulated collecting on the fenced-in dumps (in German)]



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