A 4 cm "Karlsbad twin" of sanidite in trachyte matrix from Ölberg, Siebengebirge, Rhineland - not far from the sanidite type locality Drachenfels. (Author: Andreas Gerstenberg)
| Dimensiones: | 600 x 451 | 
| Tamaño fichero: | 32.02 kbytes | 
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