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Hibonite and Willemite Optical Properties


Willemite and Hibonite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Resinous   

Pleochroism
O = brownish gray; E = gray   
NilArthur Thomas   

Dispersion
Not Available   
Not Available   

Transparency
Handbook of mineralogy (2001)   
Transparent, Translucent   

Refractive Index
1.79-1.807   
1.687-1.723   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
Trigonal   

Birefringence
Not Available   
0.028-0.030   

Clarity
Handbook of mineralogy (2001)   
Transparent   

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Hibonite and Willemite Optic Character

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

Similar to their colors, Hibonite and Willemite 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, Hibonite is Handbook of mineralogy (2001) while Hibonite is Handbook of mineralogy (2001) in appearance.

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