1) Pleochroism 1) Variegation 
• (n.) The quality possessed by some crystals of presenting different colors in three different directions.
The property of most doubly refractive, colored gemstones belonging to the orthorhombic, monoclinic, and triclinic crystal systems, of transmitting three different colors in three different directions when observed through a dichroscope in transmitted light.
(from the article `pleochroism`) ...absorption in crystals of light vibrating in different planes. Pleochroism is the general term for both dichroism, which is found in uniaxial ...
exhibits different colors in 3 different directions when viewed by transmitted light
(tri´kro-iz-әm) the condition or quality of exhibiting three different colors when viewed from three different aspects. adj., trichro´ic., adj.
The transmission of three different colors in threedifferent optical planes as light passes through a gemstonematerial. May be used to distinguish one gemstone material fromothers.
Type: Term Pronunciation: trī′krō-izm Definitions: 1. The property of some crystals of emitting different colors in three different directions.
Trichroism is the quality possessed by some crystals of presenting different colours in three different directions.
[n] - pleochroism of a crystal so that it exhibits three different colors when viewed from three different directions
trichroism The property of some crystals of exhibiting different colors in three different directions when viewed by transmitted light.
noun pleochroism of a crystal so that it exhibits three different colors when viewed from three different directions