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Colemanite and Tourmaline Optical Properties


Tourmaline and Colemanite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
NilArthur Thomas   
typically moderate to strong   

Dispersion
Not Available   
0.02   
22

Transparency
Transparent   
Transparent, Translucent, Transparent to opaque   

Refractive Index
1.584-1.615   
1.614-1.666   

Optic Character
Not Available   
Not Available   

Crystal System
Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a   
Trigonal   

Birefringence
0.028-0.030   
0.014-0.040   

Clarity
Transparent   
Transparent   

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Colemanite and Tourmaline Optic Character

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

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

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