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Answer for the clue "The phenomenon of different colors appearing when certain crystals are viewed from different directions ", 11 letters:
pleochroism

Word definitions for pleochroism in dictionaries

WordNet Word definitions in WordNet
n. the phenomenon of different colors appearing when certain crystals are viewed from different directions

Wiktionary Word definitions in Wiktionary
n. (context physics English) The optical phenomenon in some colored, transparent crystals (such as tourmaline) in which the color is different in different directions.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Pleochroism \Ple*och"ro*ism\, n. [Gr.? mor? + ? color.] (Crystallog.) The property possessed by some crystals, of showing different colors when viewed in the direction of different axes.

Wikipedia Word definitions in Wikipedia
Pleochroism is an optical phenomenon in which a substance appears to be different colors when observed at different angles, especially with polarized light.