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Germany | |
| www.mindat.org (n.d.) https://www.mindat.org/photo-277816.html |
| Schreyer, W., Maresch, W.V., Daniels, P., Wolfsdorff, P., (1990): Potassic cordierites: characteristic minerals for high-temparature, very low-pressure environmnets, Contributions to Mineralogy and Petrology, Vol, 105, 2/March 1990, 162-172 |
Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany