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| View Original: | Obsidian 1.jpg (1284x1698) | |||
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| Keywords: Obsidian 1.jpg Vulcanic glass obsidian from collection of National Museum Prague Czech Republic Sopečné sklo obsidián ze sbírek Národního muzea v Praze own Karelj 2008-04-20 Obsidian samples Geological and mineralogical Exhibition NM Prague | ||||
