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Message * Articles On Volcanic Rocks, including Obsidian, Volcano, Basalt, Rhyolite, Pyroclastic Flow, Volcanic Glass, Dacite, Trachyte, Latite, Andesite, Phonolite, Porphyry (geology), Porphyritic, Volcanic Rock, Pyroclastic Rock, Nephelinite - 1243203315 - 9781243203311