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Franklinite and Tourmaline Optical Properties


Tourmaline and Franklinite Optical Properties


Optical Properties

Luster
Not Available   
Vitreous   

Pleochroism
Not Available   
typically moderate to strong   

Dispersion
Not Available   
0.02   
22

Transparency
Translucent   
Transparent, Translucent, Transparent to opaque   

Refractive Index
Not Available   
1.614-1.666   

Optic Character
Not Available   
Not Available   

Crystal System
Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m   
Trigonal   

Birefringence
Not Available   
0.014-0.040   

Clarity
Translucent   
Transparent   

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Franklinite and Tourmaline Optic Character

Franklinite and Tourmaline optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Franklinite and 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 Franklinite and 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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Franklinite and Tourmaline Transparency

Similar to their colors, Franklinite and 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, Franklinite is Translucent while Franklinite is Translucent in appearance.

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