(Perlenhardt, Königswinter, Siebengebirge, Nordrhein-Westfalen, Deutschland)
Ancient quarries in the Alkalitrachyte of Perlenhardt located 0,5 km south of Ittenbach and 5 km east of Königswinter.
Ref.:
- Laspeyres, H., (1900): Das Siebengebirge am Rhein, Verhandlungen des naturhistorischen Vereins der preussischen Rheinlande…,Vol 57, 119-596
- Brauns R., (1922): Die Mineralien der Niederrheinischen Vulkangebiete, Schweitzerbart, Stuttgart
- Hofmann, H., (1951): Das Siebengebirge, Der Aufschluss, Vol 2, 50-58
- Frechen J., (1976): Siebengebirge am Rhein, Laacher Vulkangebiet, Maargebiet der Westeifel, Bornträger, Berlin Stuttgart
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Map Reference: 50°40'30"N , 7°16'0"E
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14 entries listed. 12 valid minerals.
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