What this green mineral could be? it's harder than glass : r
It's hard, smooth, and translucent, and the edges are sharp enough
Obsidian - Wikipedia
What Kind Of Minerals and Crystals Can Be Found In Ohio?
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I have no idea if this is glass, mineral, rock, or something else
Green rock identification! I am very intrigued about this rock
9 Deadliest Rocks And Minerals On Earth
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14 Mineral Descriptions – Mineralogy
What is the Hardness property of a glass? How to determine
Mohs Hardness Scale
Fluorite - Wikipedia
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3 Minerals – An Introduction to Geology