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Tantalite
Tantalite

Zoisite
Zoisite



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Tantalite
X
Zoisite

Tantalite and Zoisite Optical Properties

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Optical Properties

Luster

Resinous
Vitreous

Pleochroism

-
X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green

Dispersion

0.030.02
0.005 1
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Transparency

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

Refractive Index

2.190-2.4571.685-1.707
1 3.25
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Optic Character

-
-

Crystal System

Orthorhombic
Orthorhombic

Birefringence

0.0830.006-0.018
0 0.296
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Clarity

TransparentWalter Schumann
Transparent

Tantalite and Zoisite Optic Character

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

Tantalite and Zoisite Transparency

Similar to their colors, Tantalite 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, Tantalite is TransparentWalter Schumann while Tantalite is TransparentWalter Schumann in appearance.