十万个为什么·科学阅读30篇（3）
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Why Do Some Minerals Shine Under Ultraviolet Light?
为什么有些矿物在紫外线下会发光？
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Some minerals glow when hit by invisible ultraviolet light.
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This glow is called fluorescence and happens due to special atoms inside the mineral.
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Different minerals glow in different colors like blue, green, or red.
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The light energy makes electrons jump and then release color as they fall back.
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Fluorescence helps scientists identify unknown rocks in the field.
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Not all minerals do this — only those with certain chemical impurities.
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Sunlight has a little UV, but black lights work better for seeing the glow.
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Geologists use UV lamps to find rare fluorescent minerals safely.