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Deep blue azurite crystals forming a layer on quartz. In the 1960s and 1970s samples of this quality were not that rare on the dumps of the Glücksrad mine, Oberschulenberg, Harz mtns. Sample width approx. 10 cm. (Author: Andreas Gerstenberg)
| Dimensions: | 600 x 450 |
| File size: | 39.23 kbytes |
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