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Danburite
Danburite

Zoisite
Zoisite



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Danburite
X
Zoisite

Danburite and Zoisite Optical Properties

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Optical Properties

Luster

Vitreous, Greasy
Vitreous

Pleochroism

Weak: pale yellow yellow
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, Translucent, Opaque . May be translucent in thin backlit sections.

Refractive Index

1.627-1.6391.685-1.707
1 3.25
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Optic Character

Biaxial/+
-

Crystal System

Orthorhombic
Orthorhombic

Birefringence

0.0060.006-0.018
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
Transparent

Danburite and Zoisite Optic Character

Danburite and Zoisite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Danburite 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 Danburite 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. Danburite has Biaxial/+ character.

Danburite and Zoisite Transparency

Similar to their colors, Danburite 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, Danburite is while Danburite is in appearance.