Surface of a porphyry rhyolite rock from central Europe, Saxony-Anhalt. The rock contains fragments of feldspars, quartz and amphibole minerals in a fine grained matrix.

Surface of a porphyry rhyolite rock from central Europe, Saxony-Anhalt. The rock contains fragments of feldspars, quartz and amphibole minerals in a fine grained matrix. - 58312582

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