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Understanding the Mohs Hardness Scale: A Guide to Mineral Toughness - realme Community
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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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Mohs Hardness Scale
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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
Silver Sheen Obsidian: The Success Stone – Stonebridge Imports