VOLCANIC GLASS + OBSIDIAN + PITCHSTONE + TACHYLITE (GEOLOGY)
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BTVOLCANIC ASHES + VOLCANIC SANDS (GEOLOGY)
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UDC551.217.24*90
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Descriptor GERVULKANISCHES GLAS + OBSIDIAN + PECHSTEIN + TACHYLIT (GEOLOGIE)
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Descriptor ENGVOLCANIC GLASS + OBSIDIAN + PITCHSTONE + TACHYLITE (GEOLOGY)
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Descriptor FREVERRES VOLCANIQUES + OBSIDIENNE + TACHYLITE (GÉOLOGIE)
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Variant GERPECHSTEIN (GEOLOGIE)
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Variant GERTACHYLIT (GEOLOGIE)
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Variant GERPERLIT (GEOLOGIE)
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Variant GEROBSIDIAN (GEOLOGIE)
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Variant ENGTACHYLYTE (GEOLOGY)
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Variant ENGOBSIDIAN (GEOLOGY)
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Variant ENGPITCHSTONE (GEOLOGY)
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Variant ENGTACHYLITE (GEOLOGY)
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Variant ENGVOLCANIC GLASS (GEOLOGY)
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Variant FREVOLCANIQUES/VERRES (GÉOLOGIE)
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Variant FREOBSIDIENNE (GÉOLOGIE)
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Variant FREPECHSTEIN (GÉOLOGIE)
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Variant FREPERLITE (GÉOLOGIE)
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Variant FRETACHYLITE (GÉOLOGIE)