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Bertrandite and Indicolite Blue Tourmaline Optical Properties


Indicolite Blue Tourmaline and Bertrandite Optical Properties


Optical Properties

Luster
Vitreous   
Not Available   

Pleochroism
none.   
Strong: dark blue light blueWalter Schumann   

Dispersion
Not Available   
0.02   
22

Transparency
TransparentAnthony et al, Handbook of mineralogy (2001)   
Transparent, Translucent   

Refractive Index
1.583-1.614   
1.614-1.666   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21   
Not Available   

Birefringence
Not Available   
0.014-0.040   

Clarity
TransparentAnthony et al   
Transparent   

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Bertrandite and Indicolite Blue Tourmaline Optic Character

Bertrandite and Indicolite Blue Tourmaline optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Bertrandite and Indicolite Blue Tourmaline Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Bertrandite and Indicolite Blue Tourmaline optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

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Bertrandite and Indicolite Blue Tourmaline Transparency

Similar to their colors, Bertrandite and Indicolite Blue Tourmaline transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Bertrandite is Handbook of mineralogy (2001) and TransparentAnthony et al while Bertrandite is Handbook of mineralogy (2001) and TransparentAnthony et al in appearance.

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