十万个为什么·科学阅读30篇（5）
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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 glowing effect is called fluorescence.这种发光现象称为荧光。
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Minerals like fluorite and calcite often show this property.萤石、方解石等矿物常具有这一特性。
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Sunlight contains invisible UV rays that trigger the glow.阳光中含有能激发发光的不可见紫外线。
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The rock absorbs UV energy and releases it as visible light.岩石吸收紫外线能量，并以可见光形式释放。
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Not all glowing rocks need UV light to shine.并非所有发光岩石都需要紫外线才能发光。
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Others, like certain quartz varieties, glow after heating or pressure.其他如某些石英变种，则在受热或受压后发光。
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Scientists study these rocks to understand Earth's mineral history.科学家通过研究这些岩石来了解地球的矿物演化史。