Opal from Goslar District, Lower Saxony, Germany
Germany | |
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SEM-EDS and Wet Chemical by Joy Desor, Gerhard Möhn | |
| Lapis, 11 (1), 9-18+42 |
| Dietrichs, J. (2006): Die Mineralien der Nickelgrube "Großfürstin Alexandra" im Ostharz. Lapis 31 (6), 28-30 70. |
Roter Bär Mine, St Andreasberg, Braunlage, Goslar District, Lower Saxony, Germany