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Tourmaline
Tourmaline

Herderite
Herderite



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Tourmaline
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Herderite

Tourmaline and Herderite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
typically moderate to strong
Not Available
1.3 Dispersion
0.02NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent, Transparent to opaque
Transparent
1.5 Refractive Index
1.614-1.6661.587-1.642
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Biaxial/+
1.7 Crystal System
Trigonal
monoclinic
1.8 Birefringence
0.014-0.0400.028-0.032
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Tourmaline and Herderite Optic Character

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

Tourmaline and Herderite Transparency

Similar to their colors, Tourmaline and Herderite 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, Tourmaline is Translucent, Transparent and Transparent to opaque while Tourmaline is Translucent, Transparent and Transparent to opaque in appearance.