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Norbergite
Norbergite

Zoisite
Zoisite



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X
Norbergite
X
Zoisite

Norbergite and Zoisite Optical Properties

Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Pale yellow very pale yellow colorlessAnthony et al
X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green

Dispersion

0.020.02
0.005 1
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Transparency

Transparent
Transparent, Translucent, Opaque . May be translucent in thin backlit sections.

Refractive Index

1.563-1.5931.685-1.707
1 3.25
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Optic Character

-
-

Crystal System

-
Orthorhombic

Birefringence

-99990.006-0.018
0 0.296
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Clarity

Transparent
Transparent

Norbergite and Zoisite Optic Character

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

Norbergite and Zoisite Transparency

Similar to their colors, Norbergite and Zoisite 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, Norbergite is Transparent while Norbergite is Transparent in appearance.