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Beryl
Beryl

Alabaster
Alabaster



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Beryl
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Alabaster

Beryl and Alabaster Optical Properties

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Optical Properties

Luster

Vitreous, Resinous
-

Pleochroism

Weak to distinct
-

Dispersion

0.01-
0.005 1
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Transparency

Transparent, Transparent to opaque
Translucent

Refractive Index

1.560-1.6041.520-1.530
1 3.25
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Optic Character

-
-

Crystal System

Hexagonal
-

Birefringence

0.0040-0.00700.010
0 0.296
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Clarity

Transparent
Translucent

Beryl and Alabaster Optic Character

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

Similar to their colors, Beryl and Alabaster 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.