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Tourmaline
Tourmaline

Friedelite
Friedelite



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Tourmaline
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Friedelite

Tourmaline and Friedelite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Not Available
1.2 Pleochroism
typically moderate to strong
NilArthur Thomas
1.3 Dispersion
0.02NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent, Transparent to opaque
Translucent
1.5 Refractive Index
1.614-1.6661.627-1.663
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal
Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/m
1.8 Birefringence
0.014-0.0400.032-0.035
Achroite
0 0.296
1.9 Clarity
Transparent
Translucent

Tourmaline and Friedelite Optic Character

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

Tourmaline and Friedelite Transparency

Similar to their colors, Tourmaline and Friedelite 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.