Pleochroism
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Pleochroism is an optical phenomenon in which a substance has different colors when observed at different angles, especially with polarized light.
Pleochroism of cordierite shown by rotating a polarizing filter on the lens of the camera
Pleochroism of tourmaline shown by rotating a polarizing filter on the lens of the camera
Optical phenomenon
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Optical phenomena are any observable events that result from the interaction of light and matter.
A 22° halo around the Moon in Atherton, California
A solar halo as seen from 41° south latitude
A circumzenithal arc over Grand Forks, North Dakota
The Belt of Venus over Paranal Observatory atop Cerro Paranal in the Atacama Desert, northern Chile