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| Cancrinite-nepheline phonolite fragment |
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| Dellen pumice quarry, Laacher See area, Eifel, Germany; Lower Laacher See Tephra |
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| Source: Thin section collection M.M. Raith |
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| Photos: MMR |
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Comments and references:
Literature: Wörner, G. & Schmincke, H.-U. (1984), Journal of Petrology 25, 805-835 |
