Pleochroism is the variety of colors under plane polarized light displayed by crystals at various angles.
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Its color in Plane polarized light is blackish-brown, and it does not show pleochroism.
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Transparent material has long been used as a gemstone with varieties kunzite and hiddenite noted for their strong pleochroism.
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This is more generally referred to as pleochroism, and the technique can be used in mineralogy to identify minerals.
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The 3T polytype, however, is not commonly pleochroic but can show green pleochroism if it is high in iron.
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Gems are sometimes cut and set either to display pleochroism or to hide it, depending on the colors and their attractiveness.
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Gemstones are basically categorized based on their crystal structure, specific gravity, refractive index, and other optical properties, such as pleochroism.
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Pleochroism is often especially intense in small spots which surround minute enclosures of other minerals, such as zircon and epidote, these are known as " pleochroic halos ."
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When placed in a reflected light, it gives off a white light with a yellowish hue and shows very weak reflectance pleochroism in oil ( Fleischer, 1974 ).
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In plane polarized light, shandite has a creamy white color and distinct pleochroism, which is the property that makes it appear to be different colors at different angles.
