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Why Do Some Rocks Glow in the Dark?
为什么有些岩石会在黑暗中发光？
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Some rocks glow softly when exposed to ultraviolet light.有些岩石在紫外线照射下会发出柔和的光。
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This glow is called fluorescence and happens due to special minerals.这种发光现象称为荧光，由特殊矿物引起。
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Minerals like calcite or fluorite absorb UV light and re-emit visible light.方解石或萤石等矿物吸收紫外线后，会重新释放出可见光。
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The light they give off is usually blue, green, or purple.它们发出的光通常呈蓝色、绿色或紫色。
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Not all rocks do this — only those with certain crystal structures.并非所有岩石都有此特性，只有具备特定晶体结构的才行。
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Sunlight contains a little UV light, so some glow even outdoors.阳光中含少量紫外线，因此有些岩石在户外也会发光。
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Scientists use this property to find rare mineral deposits underground.科学家利用这一特性探测地下稀有矿藏。
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Fluorescence is safe and does not mean the rock is radioactive.荧光是安全的，并不意味着岩石具有放射性。