十万个为什么·科学阅读30篇（3）
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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 shine softly when it gets dark.有些岩石在天黑后会发出柔和的光。
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This light is called phosphorescence, not heat.这种光称为磷光，而非热量。
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Sunlight or UV light gives energy to special minerals.阳光或紫外线为特殊矿物提供能量。
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These minerals slowly release that energy as visible light.这些矿物缓慢地将能量以可见光形式释放出来。
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Common glowing minerals include calcite and willemite.常见的发光矿物有方解石和硅锌矿。
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The glow fades after minutes or hours.发光现象会在几分钟或几小时内逐渐消失。
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It only happens with certain rocks found underground.它只发生在地下特定的岩石中。
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Scientists study this to learn about mineral structures.科学家通过研究这一现象来了解矿物结构。