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Astrophyllite and Spinel Optical Properties


Spinel and Astrophyllite Optical Properties


Optical Properties

Luster
Greasy, Pearly   
Vitreous   

Pleochroism
Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow   
Absent   

Dispersion
Not Available   
0.02   
18

Transparency
Translucent   
Transparent, Translucent, Transparent to translucent   

Refractive Index
1.678-1.758   
1.73   

Optic Character
Not Available   
Not Available   

Crystal System
Triclinic   
Isometric   

Birefringence
0.050   
Not Available   

Clarity
Translucent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Astrophyllite and Spinel Optic Character

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

Similar to their colors, Astrophyllite and Spinel 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, Astrophyllite is Translucent while Astrophyllite is Translucent in appearance.

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