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Andalusite and Apatite Optical Properties


Apatite and Andalusite Optical Properties


Optical Properties

Luster
Vitreous, Greasy   
Vitreous   

Pleochroism
strongly trichroic   
Blue stones – strong   

Dispersion
0.02   
23
0.01   
27

Transparency
Transparent, Translucent   
Gemmological Tables (2004) More from other references   

Refractive Index
1.627-1.650   
1.628-1.651   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Hexagonal   

Birefringence
0.009-0.010   
0.002-0.008   

Clarity
Transparent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Andalusite and Apatite Optic Character

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

Similar to their colors, Andalusite and Apatite 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, Andalusite is Translucent and Transparent while Andalusite is Translucent and Transparent in appearance.

Brown Gemstones

Brown Gemstones


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