Which of the minerals below show pleochroism?
aquamarine
bixbite
alexandrite
topaz
Pleochroism is an optical phenomenon in which a substance has different colors when observed at different angles, especially with polarized light. Alexandrite appears greenish in daylight where the full spectrum of visible light is present, and reddish in incandescent light which emits less green and blue spectrum.
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aquamarine
bixbite
alexandrite
topaz
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