(Grube Käfersteige, Würm, Pforzheim, Schwarzwald, Baden-Württemberg, Deutschland)
Fluorite-quartz vein deposit, hosted in bunter sandstones along the suture zone between the Moldanubian and Saxothuringian units of the Hercynian fold belt. The vein trends ENE, is either vertical or dips steeply to the north and extends over a strike length of 250-1500m. Its thickness varies from 5-30m. To the north, it is bounded by a clay gouge which is up to 15m thick.
Located between Würm and Tiefenbronn, about 7.5 km SE of Pforzheim. The mine was closed by the end of 1996 because of decreasing industrial demand for fluorite. Since spring 2005, it is prepared for being re-opened.
References:
- Lapis 1984(1), 44
- Rüsenberg, K.(1986): Ein bemerkenswerter Eigenfund. Emplektit von der Grube Käfersteige bei Pforzheim. LAPIS 11 (4), 34
- S. Weiß: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
- K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
- Meyer, M., Brockamp, O., Clauer, N., Renk, A., and Zuther, M. (2000): Further evidence for a Jurassic mineralizing event in central Europe: K-Ar dating of hydrothermal alteration and fluid inclusion systematics in wall rocks of the Käfersteige fluorite vein deposit in the northern Black Forest, Germany. Mineralium Deposita 35, 754-762.
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Map Reference: 48°49'50"N , 8°47'7"E
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