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Why are crystals sparkly?

Updated: 8/9/2023
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12y ago

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Since diamond have high refractive index (about 2.4) , the critical angle for total internal reflection is only 25o . Incident light , therefore strikes many of the internal faces before it strikes one at less than 25o and emerges .After such many reflections , the light has traveled far enough that the colours have become sufficiently separated to be seen individually and brilliantly.This makes diamonds glitter.

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13y ago
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12y ago

because since they are angled at an angle reflect light, making them so sparkly

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