CONFIDENTIAL. Obsidian Igneous A natural volcanic glass formed in quick-cooling lava. Sharp edged but smooth on surface. Colours: black, purple blue. - ppt download
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PDF] The Obsidian Evidence for the Scale of Social Life during the Palaeolithic | Semantic Scholar
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Mr. Wigmore Tech Lab on X: "The hardness of rocks in #Minecraft is not the same as reality?!? #mohshardnessscale Obsidian was the big surprise! https://t.co/5E2X3BdNZn" / X
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