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Andalusite
Andalusite

Zinnwaldite
Zinnwaldite



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Andalusite
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Zinnwaldite

Andalusite and Zinnwaldite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Greasy
Pearly, Vitreous
1.2 Pleochroism
strongly trichroic
Distinct
1.3 Dispersion
0.02NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
Not Available
1.5 Refractive Index
1.627-1.6501.565-1.625
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
monoclinic
1.8 Birefringence
0.009-0.0100.040-0.050
Achroite
0 0.296
1.9 Clarity
Transparent
Not Available

Andalusite and Zinnwaldite Optic Character

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

Andalusite and Zinnwaldite Transparency

Similar to their colors, Andalusite and Zinnwaldite 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.