Feldspar Group from Eifel Mountains, Germany/Belgium
Germany | |
| Blaß, G. and Kruijen, F. (2015) Neuigkeiten aus der Vulkaneifel (II/2015). Mineralien-Welt, 26(5), 80-90. |
| Rambaldi, E., Jagoutz, E. & Wasson, J. T. (1974) Bitburg, a group-IB iron meteorite with silicate inclusions. Mineralogical Magazine 39 (305): 595-600. (March 1974) |
| Personally collected by Günter Frenz |