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What is trichroism?

What is trichroism? Here are some definitions.

Noun
  1. The property of some optically anisotropic crystals of transmitting different colours of light in three different spatial directions.
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Examples
Most tanzanite is treated with heat to deepen the primary colors, and this subdues the trichroism slightly.
This is one of the features of the stone and is due to Tanzanite's trichroism.
The cutter must orient the rough carefully, taking iolite's trichroism of blue, gray and near colorless into account.
In the more familiar blue variety, stones exhibit blue, violet and reddish orange but in fancy colors the trichroism is as follows.
A biaxial crystal, one having two optic axes, will exhibit trichroism, in which three colours, sometimes called face colours, may be observed.

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