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Hibonite and Axinite Optical Properties


Axinite and Hibonite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
O = brownish gray; E = gray   
Strong   

Dispersion
Not Available   
0.02   
21

Transparency
Handbook of mineralogy (2001)   
Gemmological Tables (2004) More from other references   

Refractive Index
1.79-1.807   
1.656-1.704   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Hexagonal   
Triclinic   

Birefringence
Not Available   
0.009-0.012   

Clarity
Handbook of mineralogy (2001)   
TransparentUlrich Henn and Claudio C. Milisenda   

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Hibonite and Axinite Optic Character

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

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Hibonite and Axinite Transparency

Similar to their colors, Hibonite and Axinite 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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