Glaucophane Spectrum (2)

This page summarize the pleochroism of glaucophane family. The 3 small crystals sections are about 90 from each other: left crystal is purple-blue (g-b), the center one is no color-violet (a-g) and the crystal to the right is no color-blue (a-b). 
 

Spectra of the small crystal to the left of the pictures above (size about 400 ).

Spectra of the center crystal.

Blue curve: a spectrum,

Red curve: g spectrum.

Spectra of the crystal to the right.

Red curve close to  a spectrum.

Blue curve = b spectrum.

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