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A trace evidence analyst places crystals of an unidentified white powdery to a stage of a polarizing microscope and observes the crystals through an

A trace evidence analyst places crystals of an unidentified white powdery to a stage of a polarizing microscope and observes the crystals through an eyepiece. Under focus some show bright colors while others appear very dark and hardly distinguishable. What can be concluded of the white powder?

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