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Beryl
Beryl

Willemite
Willemite



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Beryl
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Willemite

Beryl and Willemite Optical Properties

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Optical Properties

Luster

Vitreous, Resinous
Vitreous, Resinous

Pleochroism

Weak to distinct
-

Dispersion

0.010.17
0.005 1
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Transparency

Transparent, Transparent to opaque
Transparent, Translucent

Refractive Index

1.560-1.6041.687-1.723
1 3.25
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Optic Character

-
-

Crystal System

Hexagonal
Trigonal

Birefringence

0.0040-0.00700.028-0.030
0 0.296
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Clarity

Transparent
Transparent

Beryl and Willemite Optic Character

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

Beryl and Willemite Transparency

Similar to their colors, Beryl and Willemite 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, Beryl is Transparent and Transparent to opaque while Beryl is Transparent and Transparent to opaque in appearance.