十万个为什么·科学阅读30篇（6）
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Why Do Some Rocks Glow Under Ultraviolet Light?
为什么有些岩石在紫外线下会发光？
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Some rocks contain special minerals that absorb UV light.有些岩石含有能吸收紫外线的特殊矿物。
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These minerals then release visible light we can see.这些矿物随后释放出肉眼可见的光。
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This glowing effect is called fluorescence.这种发光现象称为荧光。
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Fluorescence happens only under ultraviolet light.荧光只在紫外线下发生。
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Not all rocks glow—only those with certain minerals.并非所有岩石都会发光，只有含特定矿物的才会。
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Calcite and fluorite are two common glowing minerals.方解石和萤石是两种常见的发光矿物。
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Scientists use this property to identify rock types.科学家利用这一特性鉴别岩石类型。
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UV lamps help geologists study rocks in the dark.紫外线灯帮助地质学家在暗处研究岩石。