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Stebanoid t1_j9kpzuq wrote on February 22, 2023 at 6:12 PM

Reply to comment by tmahfan117 in ELI5: Are all solids minerals? If not, why? by CaitlinN22

In geology, mineral must also have crystalline structure. So, obsidian is a natural inorganic rock, but not a mineral, because it's a glass, not a crystal or a bunch of crystals.