Cave/Subterranean Lighting

I have a cave that is ravine like and stretches approximately one kilometer down into the Earth. Let's assume that the cave has a clear, crystalline roof allowing some light in.

Is there any sort of crystal, mineral, substance, or something else naturally occurring that could reflect light into most parts of the cave?

I want the cave to have enough available light for average plants and such to grow with the upper half of the ravine.

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Cave/Subterranean Lighting

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