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.
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This light is called phosphorescence, not heat.
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Sunlight or UV light gives energy to special minerals.
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These minerals slowly release that energy as visible light.
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Common glowing minerals include calcite and willemite.
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The glow fades after minutes or hours.
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It only happens with certain rocks found underground.
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Scientists study this to learn about mineral structures.