Do α-quartz, β-quartz, α-cristobalite, β-cristobalite and tridymite have the same refractive index, why?

12 April 2020 0 9K Report

Do α-quartz, β-quartz, α-cristobalite, β-cristobalite and tridymite have the same refractive index, why? Please give the root reason, thanks.

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