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Herderite and Tourmaline Optical Properties


Tourmaline and Herderite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Not Available   
typically moderate to strong   

Dispersion
Not Available   
0.02   
22

Transparency
Transparent   
Transparent, Translucent, Transparent to opaque   

Refractive Index
1.587-1.642   
1.614-1.666   

Optic Character
Biaxial/+   
Not Available   

Crystal System
monoclinic   
Trigonal   

Birefringence
0.028-0.032   
0.014-0.040   

Clarity
Transparent   
Transparent   

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Herderite and Tourmaline Optic Character

Herderite and Tourmaline optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Herderite 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 Herderite 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. Herderite has Biaxial/+ character.

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Herderite and Tourmaline Transparency

Similar to their colors, Herderite 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, Herderite is Transparent while Herderite is Transparent in appearance.

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