黑曜岩
黑曜石（英语：Obsidian）又名十胜石，是一种自然产生个玻璃。成因是因为火山熔岩迅速冷却凝结，没足够个辰光让矿物晶体长出，而形成玻璃质。因为熔岩流外围冷却个速度最快，所以黑曜石通常侪是拉熔岩流外围发现。
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