Monday, April 29, 2013

epidote

Epidote, Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH).
The anisotropy, or directional asymmetry, of epidote causes the stone to appear different colors from different directions. The crystal structure bends light differently depending on the path, appearing to you as a color change.
This picture shows a bluish-green for the crystals on the left, and a more yellow-green on the right.


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