B: Crossed Nichols (XN)7) Birefringence.This is the most important property of minerals under crossed polars. It is defined as the difference between the index of refraction of the minimum and maximum refractive indices of a mineral. For uniaxial minerals; no– neorne- no. For biaxial crystals; na– ncornc- na.As far as you are concerned, you see pretty colours under XNOptical Properties
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