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"Porzellanjaspis" (porcelaine jasper) - a mixture of indialite, mullite, quartz and clay minerals is often found on burning coal dumps or in basalt rocks. The shown one is a very old sample from Planitz near Zwickau, Saxony (5 cm). (Author: Andreas Gerstenberg)
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| File size: | 36.27 kbytes |
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